Black-Oxide Drill Bits Material: 40 chrome steel User:for marble,concrete and dranite etc

Black-oxide drill 

Bright finish, black oxide, brown OEM orders are accepted Material: 40 chrome steel Hard carbide: YG8C (K20) User:for marble,concreteand dranite etc.

     If you have any special enquires about HSS drill bit/sets, sds hammer drill bit/sets,masonry drill bit /sets, wood drill bit/sets, auger bit/sets, or another drill bit/sets, please contact with us asap.

     We promise we would reply you in 2 workday .