Manufacturer:  Greenlee

Complete hole drilling, tapping and deburring/countersinking in one operation with power drill saves labor and time.
Back tapered beyond tap toprevent thread damage from over-drilling.
Deburr/countersink also provided on bit beyond back taper.
Made from hardened high-speed steel vs. carbon steel for longer life.
High quality hex shank to ensure strong connection to drill chuck.
Designed to tap up to 10-gauge metal.
Quick change adaptor included in both metric and standard kits.

Additional information