X-ACTO knives are the preferred cutting tool for a wide variety of professionals and hobbyists alike. Designers and artists love the X-ACTO knife’s ability to produce careful and meticulous cuts with consistency while engineers praise the knife’s durable design and reliability. The X-ACTO #5 Heavy Duty Plastic Knife is a hardworking knife that can stand up to some of the toughest tasks. The heavy duty knife handle is compatible with X-ACTO #2 15 18 19 22 23 24 25 26 and 28 blades as well as the router assortment and saw blades.