{"product_id":"supra-mk-stiff-3-4-natural-bristle-brushes-unmounted-1-8-hole-pack-12","title":"Pack-12 Supra MK Stiff 3\/4\" Natural Bristle Brushes-Unmounted With 1\/8\" Hole","description":"\u003cp\u003eSupra MK 3\/4\" Stiff natural bristle brushes are unmounted miniature brushes designed for professional jewelers and metalsmiths who demand consistent, even performance across flat, curved, small, and hard-to-reach surfaces. These brushes feature \u003cstrong\u003esolid steel ring construction\u003c\/strong\u003e with filaments permanently anchored and uniformly distributed for even wear throughout the life of the brush. Made with natural animal hair, they deliver reliable stiffness for controlled finishing and polishing applications.\u003c\/p\u003e\u003cp\u003eEach brush includes a \u003cstrong\u003e1\/8\" diameter center hole\u003c\/strong\u003e for use with compatible hub adapters and screw mandrels. Note that using a 3\/32\" diameter screw mandrel with this hole size will result in a loose, sloppy fit—use the correct 1\/8\" hardware for secure mounting. Otto Frei also carries natural bristle brushes with 3\/32\" diameter holes if that configuration is required.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eSold by the dozen.\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003e\u003cem\u003e*Supra does not manufacture extra soft bristle brushes. Extra soft bristle brushes are made in China.\u003c\/em\u003e\u003c\/p\u003e\u003ch3\u003eFeatures\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eStiff natural animal hair bristles for controlled polishing and finishing\u003c\/li\u003e\n\u003cli\u003eSolid steel ring construction for durability and long service life\u003c\/li\u003e\n\u003cli\u003eFilaments permanently anchored and uniformly distributed for even wear\u003c\/li\u003e\n\u003cli\u003e1\/8\" center hole for use with compatible hub adapters and screw mandrels\u003c\/li\u003e\n\u003cli\u003eEffective on flat, curved, small, and hard-to-reach surfaces\u003c\/li\u003e\n\u003cli\u003eMade in the USA\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003ctable\u003e\n\u003ctr\u003e\n\u003cth\u003eBrush Diameter\u003c\/th\u003e\n\u003ctd\u003e3\/4\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eBristle Type\u003c\/th\u003e\n\u003ctd\u003eNatural animal hair\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eStiffness\u003c\/th\u003e\n\u003ctd\u003eStiff\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eHole Diameter\u003c\/th\u003e\n\u003ctd\u003e1\/8\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eRing Construction\u003c\/th\u003e\n\u003ctd\u003eSolid steel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eMaximum Operating Speed\u003c\/th\u003e\n\u003ctd\u003e25,000 RPM\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eMount Type\u003c\/th\u003e\n\u003ctd\u003eUnmounted\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eCountry of Origin\u003c\/th\u003e\n\u003ctd\u003eUSA\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eSold As\u003c\/th\u003e\n\u003ctd\u003ePack of 12 (1 dozen)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\u003ch3\u003eNotes\u003c\/h3\u003e\u003cp\u003eCompatible hub adapters: \u003cstrong\u003e147.257\u003c\/strong\u003e or \u003cstrong\u003e147.259\u003c\/strong\u003e. Compatible screw mandrels with 1\/8\" diameter screws: \u003cstrong\u003e143.160\u003c\/strong\u003e or \u003cstrong\u003e143.162\u003c\/strong\u003e. Using a 3\/32\" screw mandrel with this 1\/8\" hole will produce an insecure fit—always match mandrel diameter to hole size.\u003c\/p\u003e","brand":"Supra","offers":[{"title":"Default Title","offer_id":43584376996054,"sku":"116.664","price":15.9,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0609\/9832\/0342\/files\/pack-12-supra-mk-stiff-34-natural-bristle-brushes-unmounted-with-18-hole-otto-frei-1.jpg?v=1719956242","url":"https:\/\/www.ottofrei.com\/products\/supra-mk-stiff-3-4-natural-bristle-brushes-unmounted-1-8-hole-pack-12","provider":"Otto Frei","version":"1.0","type":"link"}