Excel Blades #18 Wood Chisel Blade - 1/2 Inch Carbon Steel Replacement Hobby Blades The Excel Blades #18 Wood Chisel Blade is a versatile replacement blade that is perfect for a variety of crafting and woodworking projects. The straight edge chisel blade is made from high-quality carbon steel for durability and sharpness. It is easy to insert and remove from your craft knife, and it fits with all standard light duty xacto style knives.Versatile replacement blade for all standard light duty xacto style knives.