Stanley Utility Knife Blade 11 983A 1.87 Inch 1996 Large Hook Replacement Blade Dispenser (100 Pack 0.025 Inch Carbon Steel Roofing Flooring Shearing) Laser Measuring Tool 5 in 1 Mini Impact Socket (NRHDM): 5 in 1 Mini Impact Socket (NRHDM): Features three primary square sizes (3 4" governed by manual adjustment thumb screws that regulate blade depth and shaving clearance down to precise fractions these specialized hook blades feature a sharpened tip designed to pierce flexible building substrates without damaging underlying surfaces Substrate Surface Protection: Deep hook curvature lifts material during cutting to prevent the blade tip from scratching or damaging underlying subfloors