Excel 20104 - 2pc No 104 Heavy Duty Concave Carving Knife Blade - For wood, plastic, rubber, foam, and vinyl. Size: 2 1/2 x 5/16 x 1 1/8 inch Edge. Made in USA. Fits 3/8 inch Type D and Excel K7 Wood Carving Handles. Excel does not offer this item in larger packages. These are similar to X-ACTO X105, which have been discontinued by X-ACTO.