... (Din 333 Form A, B, R). Plain type, bell type,radius type. COMBINED DRILLS AND COUNTERSINKS (CENTER DRILL BITS).Material: HSS, HSSCO. ... Feature(Din 333 Form A, B, R). Plain type, bell type and radius type.Ground,bright finish.Product Specification/ModelsSize: 1-10mm; ... manufacturing operations.Tin--coating on requestSolid carbide k10 micro-fine on request Combined Drill and Countersink High speed steel