X-Acto - No. 5 Heavy Duty Knife - Carded - X-Acto No. 5 Knife is built for heavy pressure cutting of heavyweight materials like wood matboard cardboard plastic and metal. Coutoured handle for a sure grip. Xacto Number 5 Knifes are for precise heavy pressure cutting of heavy weight materials. Wood, board, paper, plastic, and metal. Includes No. 19 Angled Wood Chiseling Blade. Previoulsy BDL17. Type C Knife.