Product Review

Specification: A set of 10 Center Drill Bits includes the 5 Imperial units sizes:1/8" 3/16" 1/4" 5/16" 3/8"

 Instructions:

1.  Choose a match type of center drill bits according to the hole type and the straight hole size of the machined parts. 
2. The heat treatment hardness of center drill bit is between 63-66HRC appropriate. 
3. Wash the rust-proof grease before using the center drill bit, so as to avoid chip sticking on the cutting edge. 
4. The surface of work-piece should be smooth to avoid center drill bit being damaged. 
5. The center drill bit should achieve the required position accuracy before drilling.