ATD Tools 9200 5 Pc. Step Drill Bit Set

Tri-flat shank design for sure grip in chuck without slippage Set Includes: 1/4" Shank: 3/16" to 1/2" holes in 1/16" steps 1/4" Shank: 1/8" to 1/2" holes in 1/32" steps 3/8" Shank: 1/4" to 3/4" holes in 1/16" steps 3/8" Shank: 3/16" to 7/8" holes in 1/16" steps 3/8" Shank: 1/4" to 1-3/8" holes in 1/8" stepsYou may also like Steel Dragon Tools® 1" (25 mm) Dry Diamond Concrete Core Drill Bit.