X-Acto - No. 18 Heavy Weight Wood Chisel - 5 Pack - X-Acto No. 18 Heavyweight Chiseling Knife Blades are great for deep cross and smooth wood chiseling. Carve Balsa, wood, linoleum, and bass wood with ease. Xacto Number 18 Blades have a 1/2 inch edge. Fits 3/8 inch X-ACTO No 2, Type c, and Type D handles, as well as Excel K2, K5, K6, and K7 Handles. This is the replacement for X-ACTO X18, which has been discontinued by X-ACTO. Includes 5 Blades.