10/pkAlpen Speedster FG 557 Bur Carbide 10/Pk Cross Cut Fissure. Used to create butt-joint margins and to enhance the proximal box of preparations for ceramic inlays/onlays and crowns. Alpen® Speedster® Carbide metal cutting burs rapidly cut amalgam, metal, enamel and dentin. The computer aided manufacturing design generates a bur that has an optimal and precise bur performance. These metal cutting burs cut aggressively without stalling or clogging, reducing prep and chair time. Alpen® Speedster® Carbides offers a full line of metal cutters, any option for your need. Sold in packs of five, available in friction grip (FG).