Safeguard your work surface or material beneath the blade with OLFA 18mm LH-20B Hook Snap Blades. Designed with high-quality carbon tool steel for an ultra-sharp edge, these 18mm blades are shaped to pull material toward the blade while keeping the sharp edge away from the surface underneath the cut. Also available in 25mm, each blade contains four segments for a new sharp edge in a snap. Cut easily through carpet, house wrap, nylon, shingles, and more. Use these heavy-duty 18mm OLFA blades with a variety of snap knife models, including L-1 Ratchet Lock Utility Knife, L-2 Utility Knife with Rubber Inset, L-5 Fiberglass Utility Knife, LA-X Fiberglass Utility Knife, NL-AL Rubber-Grip Auto-Lock Utility Knife, and NOL-1 Rubber-Grip Ratchet-Lock Utility Knife.