{"product_id":"grs-004-489-brass-channel-practice-ring-3mm","title":"GRS 004-489 Brass Channel Ring With Holes Sold by the Piece","description":"\u003cp\u003eThe GRS 004-489 Brass Channel Practice Ring is a precision-made training blank designed for jewelers and stone setters to develop and refine channel-setting skills. Made from solid brass, this ring features evenly spaced pre-drilled holes sized for 3 mm stones, enabling consistent, repeatable practice without consuming precious metals or materials.\u003c\/p\u003e\n\n\u003ch3\u003eFeatures\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eSolid brass construction — durable and well-suited for practice and demonstration use\u003c\/li\u003e\n\u003cli\u003ePre-drilled holes sized for 3 mm stones for consistent channel-setting training\u003c\/li\u003e\n\u003cli\u003eDelivers a realistic channel-setting experience without the cost of gold or platinum\u003c\/li\u003e\n\u003cli\u003eSold individually — one ring per piece\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003ctable\u003e\n\u003ctr\u003e\n\u003cth\u003ePart Number\u003c\/th\u003e\n\u003ctd\u003e004-489\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eMaterial\u003c\/th\u003e\n\u003ctd\u003eBrass\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eOutside Diameter\u003c\/th\u003e\n\u003ctd\u003e24.8 mm (0.890\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eWidth\u003c\/th\u003e\n\u003ctd\u003e7 mm (0.280\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eStone Hole Size\u003c\/th\u003e\n\u003ctd\u003e3 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eSold By\u003c\/th\u003e\n\u003ctd\u003ePiece\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eNotes\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003ePractice ring blank only — stones are not included\u003c\/li\u003e\n\u003cli\u003eThis product is subject to California Proposition 65 warnings\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Glendo GRS","offers":[{"title":"Default Title","offer_id":43579927593174,"sku":"126.551","price":33.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0609\/9832\/0342\/files\/grs-004-489-brass-channel-ring-with-holes-sold-by-the-piece-otto-frei.jpg?v=1719958356","url":"https:\/\/www.ottofrei.com\/ja\/products\/grs-004-489-brass-channel-practice-ring-3mm","provider":"Otto Frei","version":"1.0","type":"link"}