X-Acto - No. 6 Heavy Duty Contoured Knife - Carded - X-Acto No. 6 Heavy Duty Contoured Knife has a Contoured Aluminum Knife Handle, for Precise, heavy pressure cutting of heavy weight materials. Wood, board, paper, plastic, and metal. Includes No 24 deburring blade. Fits 3/8 inch Blades. Type C Knife.