Excel Heavy Duty Assorted Blade 5 Pack. Heavy Duty Carbon Steel Blades. For wood, plastic, rubber, foam and vinyl. Includes: one straight edge blade, size: 2 5/16" x 3/8" x 1 1/2" edge; one angled straight edge blade, size: 2 3/8" x 5/16" x 1 1/8" edge; one convex blade, size: 2 1/4" x 5/16" x 1" edge; one concave edge blade, size: 2 1/2" x 5/16" x 1 1/8" edge; one semi concave blade, size: 2 1/4" x 5/16" x 3/4" edge. Fits the 904 Woodcarving Knife.