Designed so a quick pull of the blade-locking lever releases the blade. Put the blade at any depth you want and push the lever back down to lock the blade in place. A unique clamping device inside the cold knife locks the blade at any height without the need for pins or bolts to fit through the holes. The pull handle is attached to the body of the cold knife so there is no need to remove the handle to change blades. Made of aluminum, the UltraWiz® style has an oblong, not round, handle. This style helps prevent a cold knife from twisting in your hand. Foam-covered pull handle for comfort. Made in the USA.