Busch 1772SS12 Fig 77B Concave Cup Bur Kit of 12 - 0.80mm to 1.90mm

Busch Burs-the most famous name in jewelers burs. Busch brand Fig. 77B Concave Cup burs are the standard cup bur shape used by jewelers for generations. Available in a wide range of sizes, this kit of 12 contains one each of the most popular sizes for finishing the tips of prongs, the number one use of cup burs for jewelers. Concave refers to the traditional cup bur shape that leaves a rounded top of a prong. There is also a Concave Cone shape available from Busch in their Burs fit 411C and Busch fig. 411CT cup burs. These tungsten vanadium steel burs are made to ultra-high precision tolerances in Germany.