Stanley Utility Knife Blade 11 983L 1.875 Inch 1996 Large Hook Replacement Blade Dispenser (50 Pack 0.024 Inch Carbon Steel Roofing Flooring Shearing) Rabbeting Bit and ground level clearing and ground level clearing and utilize the rear accessory port to attach a secondary safety beacon to ensure 360 degree personal illumination during low light or night work environments these deep hook replacement blades feature dual sharp points that pierce flexible building substrates without scratching underlying surfaces Substrate Protection Design: Hooked tip lifts sheet goods during cutting to prevent scratching underlying deck surfaces or wood subflooring