X-Acto - No. 17 Light Weight Chisel Blade - 5 Pack - X-Acto No. 17 Lightweight Chiseling Knife Blades are great for precision chiseling balsa wood, linoleum, bass wood, and plastic. Xacto Number 17 Blades have a 1/4 inch edge. Fits 1/4 inch Type A X-ACTO or Excel Handles. This is the replacement for X-ACTO X17, which has been discontinued by X-ACTO. Includes 5 Blades.