{"product_id":"17mm-to-37mm-metal-step-up-ring-phone-cage-cpl-nd-filter","title":"17mm to 37mm Metal Step-Up Ring for Phone Cage \u0026 Filters","description":"\u003ch2\u003e17mm to 37mm Aluminum Alloy Step-Up Ring for Phone Cage\u003c\/h2\u003e\n\u003cp\u003eUpgrade your mobile photography setup with this precision-machined \u003cstrong\u003e17mm to 37mm metal step-up ring\u003c\/strong\u003e. Designed specifically for phone cages, this compact adapter lets you attach 37mm CPL, ND, and other filters directly to your smartphone rig — unlocking a whole new level of creative control on the go.\u003c\/p\u003e\n\n\u003ch3\u003eWhy You'll Love It\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePremium Aluminum Alloy Construction:\u003c\/strong\u003e Built from quality aluminum alloy for exceptional durability and rust resistance, delivering long-lasting performance without wear.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePrecision Machined:\u003c\/strong\u003e Advanced manufacturing ensures a secure, seamless connection that prevents light leaks or blurring, enhancing your overall image quality.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eVersatile Filter Compatibility:\u003c\/strong\u003e Bridges the gap between 17mm and 37mm thread sizes, giving you access to a wide range of 37mm CPL and ND filters for diverse creative needs.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eLightweight \u0026amp; Portable:\u003c\/strong\u003e Compact design adds minimal weight to your setup — ideal for outdoor shoots and on-the-go content creation.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFast Screw-On Installation:\u003c\/strong\u003e Simple screw-on\/screw-off mechanism means quick attachment and detachment, streamlining your workflow on every shoot.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eAnti-Slip Design:\u003c\/strong\u003e Textured grip ensures the ring stays firmly in place once secured.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Aluminum Alloy\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eOuter Diameter:\u003c\/strong\u003e Approx. 37mm \/ 1.46 in\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eInner Diameter:\u003c\/strong\u003e Approx. 17mm \/ 0.67 in\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCompatible Filters:\u003c\/strong\u003e 37mm CPL, ND, and more\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePackage Includes:\u003c\/strong\u003e 1 × Step-Up Ring Lens Adapter\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cem\u003eMade in Mainland China.\u003c\/em\u003e\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eNote:\u003c\/strong\u003e Please allow 1–3mm variance due to manual measurement. Colors may vary slightly due to differences in monitor settings.\u003c\/p\u003e\n\n\u003ch3\u003eExplore More Photography Accessories\u003c\/h3\u003e\n\u003cp\u003eLooking to complete your creative kit? Check out our \u003ca href=\"\/products\/10-piece-complete-gardening-tool-kit\"\u003e10-Piece Tool Kit\u003c\/a\u003e for outdoor shoot prep, or browse our \u003ca href=\"\/products\/1-2-inch-8-piece-hex-short-socket-set-vanadium-steel\"\u003e1\/2\" Drive 8-Piece Hex Socket Set\u003c\/a\u003e for handy on-set tool solutions. For fun desk accessories between sessions, take a look at our \u003ca href=\"\/products\/1-set-pottery-clay-sculpting-tools-smoothing-wax-carving-pottery-ceramic-tools-polymer-shapers-modeling-carved-tool-sculpture\"\u003ePottery Clay Sculpting Tools Set\u003c\/a\u003e.\u003c\/p\u003e\n\n\u003cp\u003eLearn more: \u003ca href=\"https:\/\/www.osha.gov\/hand-power-tools\" target=\"_blank\" rel=\"noopener\"\u003eOSHA guidance on hand and power tools\u003c\/a\u003e\u003c\/p\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003ch4\u003eQ: What phone cage thread sizes is this 17mm to 37mm step-up ring compatible with?\u003c\/h4\u003e\n\u003cp\u003eA: This step-up ring is designed to fit phone cages or lens mounts with a 17mm inner thread, allowing you to attach any standard 37mm screw-on filter — including 37mm CPL (circular polarizer) and ND (neutral density) filters.\u003c\/p\u003e\n\u003ch4\u003eQ: Will this step-up ring add noticeable weight or bulk to my smartphone rig?\u003c\/h4\u003e\n\u003cp\u003eA: No — the ring is crafted from lightweight aluminum alloy, keeping added weight to an absolute minimum. Its compact profile makes it easy to carry and use during outdoor or travel shoots without affecting the balance of your phone cage setup.\u003c\/p\u003e\n\u003ch4\u003eQ: How do I attach and remove this step-up ring?\u003c\/h4\u003e\n\u003cp\u003eA: The ring features a simple screw-on design. Just thread it onto your 17mm phone cage mount clockwise to secure it, then thread on your 37mm filter as normal. To remove, simply unscrew counterclockwise. No special tools are required.\u003c\/p\u003e\n\u003c!-- production-packaging-notice --\u003e\n\u003ch3\u003eProduction \u0026amp; Packaging Notice\u003c\/h3\u003e\n\u003cp\u003eTo maintain high stock availability and fast shipping times, our items are sourced from multiple verified manufacturing facilities. While the core quality, materials, and product specifications remain identical, you may notice slight variations in the packaging design, manufacturing origin, or the wording of the printed instructions.\u003c\/p\u003e\n\u003cscript type=\"application\/ld+json\"\u003e{\"@context\": \"https:\/\/schema.org\", \"@type\": \"FAQPage\", \"mainEntity\": [{\"@type\": \"Question\", \"name\": \"What phone cage thread sizes is this 17mm to 37mm step-up ring compatible with?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"This step-up ring is designed to fit phone cages or lens mounts with a 17mm inner thread, allowing you to attach any standard 37mm screw-on filter — including 37mm CPL (circular polarizer) and ND (neutral density) filters.\"}}, {\"@type\": \"Question\", \"name\": \"Will this step-up ring add noticeable weight or bulk to my smartphone rig?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"No — the ring is crafted from lightweight aluminum alloy, keeping added weight to an absolute minimum. 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