... Countersink (Center Drill Bit) High speed steel. (Din 333 Form A, B, R). Plain type, bell type,radius type. COMBINED DRILLS ... DRILL BITS).Material: HSS, HSSCO.Product Feature(Din 333 Form A, B, R). Plain type, bell type and radius type.Ground ... /64"ApplicationThese are designed with 118 degree point angle and a 60 degree countersink included angle with spiral flutes. They are used ...