Product Description Excel Blades #21 Stainless Steel Hobby Blades, Multi-Pack Precision Light to Medium Duty Replacement Blades Achieve ultimate precision with Excel Blades #21 Stainless Steel Hobby Blades. These classic, super sharp blades are 100% made in the USA with a durable stainless steel straight edge, perfect for detailed trimming and scoring across a variety of materials including wood, plastic, paper, leather, and more. Compatible with all standard light to medium duty craft knivesincluding popular Xacto knivesthese replacement blades are trusted by artists, designers, hobbyists, and crafters. Whether youre working on scrapbooking, model kits, paper crafts, or wood carving, the #21 blades deliver consistent, precise results.