OLFA Auto-Lock Utility Knife is designed with an auto-locking blade slide for safety with a stainless steel handle for durability. Built-in safety blade snapper for rapid blade change. Great for both left- and right-handed use. Standard Snap-Off Blades come with 13 cutting edges per blade strip. UltraMax® Blades are developed using a double honing process so they're 25% sharper than Standard Blades. Utility Knife with Handsaver Cushion Grip is designed for maximum control and comfort. Refill Blades for Utility Knife keep you prepared for tough cutting jobs.