Features and Benefits:

• Carbide tipped and made for use in drilling hardened steel in the range of 48 to 65 Rockwell "C"
• Holes may be drilled without annealing or appreciably changing the structure of the material
• Can be used for drilling broken studs, spring bolts, die sections, broken easy outs, extra tough metals, exotic metals, brake drums, etc.

Set includes:  1/8", 3/16", 1/4", 5/16"x4, 3/8"x4