{"product_id":"durston-2127-large-ring-stretcher-mandrel-21-24mm","title":"Durston 2127 Large Ring Stretcher Mandrel","description":"\u003cp\u003eThe Durston 2127 Large Ring Stretcher Mandrel is an expanding mandrel purpose-built for enlarging and truing rings with larger diameters. Its compact 92 mm length keeps it practical for bench use, easy to stow in a drawer, or pack into a tool roll. Once secured in a vise, clamp, or appropriate machine fixture, the mandrel expands evenly as you tighten the center bolt with the included hex key—giving you controlled, incremental sizing without distorting the shank.\u003c\/p\u003e\n\n\u003ch3\u003eFeatures\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003eExpanding mandrel sized for large ring diameters in the 21–24 mm range\u003c\/li\u003e\n  \u003cli\u003eCompact 92 mm total length for easy bench storage or travel\u003c\/li\u003e\n  \u003cli\u003eCenter bolt expansion mechanism delivers even, controlled stretching in small increments\u003c\/li\u003e\n  \u003cli\u003eHex key included for tightening the center bolt\u003c\/li\u003e\n  \u003cli\u003eCan be secured in a vise, clamp, or suitable lathe\/polisher fixture\u003c\/li\u003e\n  \u003cli\u003eSupports gentle sizing adjustments and truing slightly out-of-round rings\u003c\/li\u003e\n  \u003cli\u003eDesigned to complement Durston's broader range of ring stretcher and sizing tools\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003ctable\u003e\n  \u003ctr\u003e\n\u003cth\u003eSpecification\u003c\/th\u003e\n\u003cth\u003eDetail\u003c\/th\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003cth\u003eTool Type\u003c\/th\u003e\n\u003ctd\u003eExpanding ring stretcher mandrel\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003cth\u003eDiameter Range\u003c\/th\u003e\n\u003ctd\u003e21–24 mm (approx. 0.83–0.94\")\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003cth\u003eTotal Length\u003c\/th\u003e\n\u003ctd\u003e92 mm (approx. 3.62\")\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003cth\u003eExpansion Mechanism\u003c\/th\u003e\n\u003ctd\u003eCenter bolt tightened with hex key\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003cth\u003eMounting\u003c\/th\u003e\n\u003ctd\u003eVise, clamp, or suitable lathe\/polisher fixture\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003cth\u003eBrand\u003c\/th\u003e\n\u003ctd\u003eDurston\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eWhat's Included\u003c\/h3\u003e\n\u003ctable\u003e\n  \u003ctr\u003e\n\u003cth\u003eItem\u003c\/th\u003e\n\u003cth\u003eDescription\u003c\/th\u003e\n\u003cth\u003eQty\u003c\/th\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003eLarge ring stretcher mandrel\u003c\/td\u003e\n\u003ctd\u003eExpanding mandrel for 21–24 mm ring diameters\u003c\/td\u003e\n\u003ctd\u003e1\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003eHex key\u003c\/td\u003e\n\u003ctd\u003eFor tightening the center bolt to expand the mandrel\u003c\/td\u003e\n\u003ctd\u003e1\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eNotes\u003c\/h3\u003e\n\u003cp\u003ePlace the ring over the mandrel, then tighten the center bolt gradually with the hex key to stretch the ring. Work in small increments and check the size frequently to avoid over-stretching, particularly on soldered joints or stone-set rings. Always secure the mandrel firmly in a vise, clamp, or appropriate machine fixture before use.\u003c\/p\u003e","brand":"Durston","offers":[{"title":"Default Title","offer_id":45999502131414,"sku":"148.2127","price":73.9,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0609\/9832\/0342\/files\/durston-2127-large-ring-stretcher-mandrel-otto-frei-1.jpg?v=1726697770","url":"https:\/\/www.ottofrei.com\/products\/durston-2127-large-ring-stretcher-mandrel-21-24mm","provider":"Otto Frei","version":"1.0","type":"link"}