{"product_id":"supra-mk-1in-soft-natural-bristle-brushes-unmounted-1-8-hole-pack-12","title":"Pack-12 Supra MK 1\" Soft Natural Bristle Brushes-Unmounted With 1\/8\" Hole","description":"\u003cp\u003eThe \u003cstrong\u003eSupra MK 1\" Soft Natural Bristle Brushes\u003c\/strong\u003e are premium unmounted miniature brushes crafted for professional jewelers and metalsmiths who demand consistent, reliable performance. Sold in packs of 12, these 1-inch brushes are \u003cstrong\u003eMade in the USA\u003c\/strong\u003e with solid steel ring construction engineered for durability and long service life. Brush filaments are permanently anchored in the solid steel ring and uniformly distributed to ensure even wear across the entire brush face — delivering predictable, repeatable results on every use.\u003c\/p\u003e\n\u003cp\u003eThese soft natural bristle brushes excel on flat, curved, small, and hard-to-reach surfaces, making them a go-to choice for detail polishing and finishing work. The natural animal hair filaments provide a gentle yet effective action suited to delicate or intricate workpieces.\u003c\/p\u003e\n\u003cp\u003eEach brush features a \u003cstrong\u003e1\/8\" diameter center hole\u003c\/strong\u003e designed for use with hub adapters \u003cstrong\u003e147.257\u003c\/strong\u003e or \u003cstrong\u003e147.259\u003c\/strong\u003e, or with screw mandrels using the correct 1\/8\" diameter screws \u003cstrong\u003e143.160\u003c\/strong\u003e or \u003cstrong\u003e143.162\u003c\/strong\u003e. \u003cem\u003eNote: Using these brushes with thinner 3\/32\" diameter screw mandrels will result in a sloppy fit.\u003c\/em\u003e Otto Frei also carries Supra natural bristle brushes with 3\/32\" diameter holes if that size better suits your setup.\u003c\/p\u003e\n\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\n\n\u003ch3\u003eFeatures\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003ePremium natural animal hair bristle construction\u003c\/li\u003e\n\u003cli\u003eSolid steel ring for exceptional durability\u003c\/li\u003e\n\u003cli\u003eFilaments permanently anchored and uniformly distributed for even wear\u003c\/li\u003e\n\u003cli\u003eIdeal for flat, curved, small, and hard-to-reach surfaces\u003c\/li\u003e\n\u003cli\u003eMade in the USA\u003c\/li\u003e\n\u003cli\u003eSold in a pack of 12\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003ctable\u003e\n\u003ctr\u003e\n\u003cth\u003eBrush Diameter\u003c\/th\u003e\n\u003ctd\u003e1 inch\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eBristle Type\u003c\/th\u003e\n\u003ctd\u003eSoft natural animal hair\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eCenter Hole Diameter\u003c\/th\u003e\n\u003ctd\u003e1\/8\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eConstruction\u003c\/th\u003e\n\u003ctd\u003eSolid steel ring\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\u003ePack Quantity\u003c\/th\u003e\n\u003ctd\u003e12\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eOrigin\u003c\/th\u003e\n\u003ctd\u003eMade in the USA\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eNotes\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eCompatible hole size is 1\/8\"; use with hub adapters 147.257 or 147.259, or screw mandrels 143.160 or 143.162.\u003c\/li\u003e\n\u003cli\u003e\u003cem\u003eUsing these brushes with 3\/32\" diameter screw mandrels will produce a sloppy fit — not recommended.\u003c\/em\u003e\u003c\/li\u003e\n\u003cli\u003eSupra also offers these brushes in Medium and Stiff bristle grades.\u003c\/li\u003e\n\u003cli\u003eOtto Frei carries Supra natural bristle brushes with 3\/32\" diameter holes as an alternative.\u003c\/li\u003e\n\u003cli\u003e\u003cem\u003eSupra does not produce extra soft bristle brushes. Extra soft options are manufactured in China.\u003c\/em\u003e\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Supra","offers":[{"title":"Default Title","offer_id":43584375783638,"sku":"116.651","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-1-soft-natural-bristle-brushes-unmounted-with-18-hole-otto-frei.jpg?v=1719956246","url":"https:\/\/www.ottofrei.com\/products\/supra-mk-1in-soft-natural-bristle-brushes-unmounted-1-8-hole-pack-12","provider":"Otto Frei","version":"1.0","type":"link"}