29pcs HSS Drill Bits Set for Metal Aluminum

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 : 1/16-1/2*1/64 inch

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.