High Speed Steel is 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