{"product_id":"busch-fig-77b-concave-cup-bur-kit-12-0-80mm-1-90mm","title":"Busch 1772SS12 Fig 77B Concave Cup Bur Kit of 12 - 0.80mm to 1.90mm","description":"\u003cp\u003eBusch burs are the most trusted name in jewelers' burs, and the \u003cstrong\u003eBusch 1772SS12 Fig. 77B Concave Cup Bur Kit of 12\u003c\/strong\u003e delivers a carefully selected range of the most popular sizes in one convenient set. Cup burs are an essential tool for finishing the tips of prongs — the number one application for cup burs in jewelry work — and this kit makes it easy to have the right size on hand for a wide variety of settings and stone sizes.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eConcave\u003c\/strong\u003e refers to the traditional cup bur shape, which leaves a smooth, rounded top on a prong after finishing. This classic profile has been the standard for jewelers for generations, providing clean, consistent results. Note that a separate concave cone shape is also available from Busch in their Fig. 411C and Fig. 411CT cup burs.\u003c\/p\u003e\u003cp\u003eEach bur in this kit is crafted from \u003cstrong\u003etungsten vanadium steel\u003c\/strong\u003e and manufactured in Germany to ultra-high precision tolerances, ensuring reliable performance and long service life across professional bench applications.\u003c\/p\u003e\u003ch3\u003eFeatures\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eClassic Fig. 77B concave cup bur profile — the industry-standard shape for prong finishing\u003c\/li\u003e\n\u003cli\u003eKit of 12 burs, one each of the most popular sizes from 0.80mm to 1.90mm\u003c\/li\u003e\n\u003cli\u003eConcave shape produces a smooth, rounded prong tip\u003c\/li\u003e\n\u003cli\u003eMade from tungsten vanadium steel for durability and precision cutting\u003c\/li\u003e\n\u003cli\u003eManufactured in Germany to ultra-high precision tolerances\u003c\/li\u003e\n\u003cli\u003eTrusted by professional jewelers for generations\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003ctable\u003e\n\u003ctr\u003e\n\u003cth\u003eModel\u003c\/th\u003e\n\u003ctd\u003e1772SS12\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFigure\u003c\/th\u003e\n\u003ctd\u003e77B Concave Cup\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eSize Range\u003c\/th\u003e\n\u003ctd\u003e0.80mm–1.90mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eKit Quantity\u003c\/th\u003e\n\u003ctd\u003e12 burs (one per size)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eMaterial\u003c\/th\u003e\n\u003ctd\u003eTungsten vanadium steel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eCountry of Origin\u003c\/th\u003e\n\u003ctd\u003eGermany\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\u003ch3\u003eNotes\u003c\/h3\u003e\u003cp\u003eThe \u003cem\u003econcave\u003c\/em\u003e cup bur shape (Fig. 77B) leaves a rounded top on prong tips. For a concave cone profile, see Busch Fig. 411C and Fig. 411CT cup burs, available separately.\u003c\/p\u003e","brand":"Busch Burs","offers":[{"title":"Default Title","offer_id":43584044335318,"sku":"B118.399KIT","price":49.3,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0609\/9832\/0342\/files\/busch-1772ss12-fig-77b-concave-cup-bur-kit-of-12-0-80mm-to-1-90mm-otto-frei.jpg?v=1719956439","url":"https:\/\/www.ottofrei.com\/products\/busch-fig-77b-concave-cup-bur-kit-12-0-80mm-1-90mm","provider":"Otto Frei","version":"1.0","type":"link"}