HSS Drill Bits Set for Metal Aluminum Black Finished

Product Name: HSS TWIST DRILL BITS

Material : HSS 4241

Process : Roll forged / full ground

Shank Type: Straight

Surface Finish : Bright finish / Tin Coated / black finish

Standard : DIN 338

Diameter : 1-13 mm

Features:

① The large increment of drill body makes the product not easy to break.

② The hole with thick core is easier.

③ Quenching temperature within 5 degrees temperature control, more stable quality.