13pcs stepped twist drills with parallel shank twist drills white diamonds

High speed steel twist drill through its relatively fixed axis of rotation cutting in drilling the workpiece hole tool. Shape because of its chip grooves into a spiral twist got its name. Spiral grooved with 2 slots, 3 or more grooves, but with 2 slots are the most popular. Twist drills can be clamped on the manual, electric handheld drill or drill press, milling machine, lathe and machining center uses. High speed steel twist drill materials for high-speed steel (HSS).

HSS straight shank twist drills, high hardness cutting speed, suitable for iron, steel, copper, aluminum, aluminum alloys, and other metals, but not suitable for stainless steel

13 sets of high speed steel twist drills, high speed steel, rolled clear white diamonds, specifications for 1.5mm-6.5mm.

Provide the following materials:

A:M42 B:M35 C:6542 D:9341 E:4341 F:4241 g: bearing steel