industry quality 3pcs HSS  step drill set titanium coated

Material: High Speed Steel ( Grade M42,M35,6542,9341,4341,4241)

Technics:CNC made

Size:    4-12 x 9 step , 4-20 x 9 step, 4-30 x 14 step

Surface: Bright ,Black, Tin-Coating, Cobalt Coating

packing:wooden case

Application: Alloyed and unalloyed steel, Stainless Steel applied by M35

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