ATD Tools 9200 Step Drill Bit Set, 5 pc.

Perfect for drilling holes in thin mild steel, aluminum, copper, brass, plexiglass, wood and laminatesTwo flutes design for true round holes and automatically deburrs as you drillTri-flat shank design for sure grip in chuck without slippage SET INCLUDES:1/4" Shank: 3/16" to 1/2" holes in 1/16" steps1/4" Shank: 1/8" to 1/2" holes in 1/32" steps3/8" Shank: 1/4" to 3/4" holes in 1/16" steps3/8" Shank: 3/16" to 7/8" holes in 1/16" steps3/8" Shank: 1/4" to 1-3/8" holes in 1/8" steps