ATD Tools 9200 Step Drill Bit Set - 5 Piece

Perfect for drilling holes in thin mild steel, aluminum, copper, brass, Plexiglas, wood and laminates. Two flutes design for true round holes and automatically deburrs as you drill. 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" steps.