Contoured Extruded Handle Quick-Change Single Set Screw Uses All 3/4" (19 mm) Shank CRL Blades These UltraWiz Long Cold Knife Handles provide the extra reach and power required to cut urethane. UltraWiz Handles are shaped for comfort and gripping power. Both Handles feature a single set screw for quick blade changes. Comes with one Cat. No. AN1002 Cut-Out Blade.