Martin Yale 1340PB Master 3-Hole Punches with Power Handle, 13/32" Hole Diameter, Punches up to 40-sheets of 20 lb. bond paper, Accepts 2 to 7 punch heads Power handle provides more leverage for easier punching Punche through up to 40 sheets of 20 lb. bond paper Adjustable punch heads for convenient 2 or 3-hole punching Accepts 2-7 punch heads / The punch hole size is 13/32 Margin depth guides adjust for custom punching needs