Protects Against Floor Impacts During Bottom Plate Cut-Outs. Floor Guard Shields Teeth From Floor Contact During Bottom Plate Cut-Outs. Double Truss Design Guides Blade For Straight Window Cut-Outs. Nail Guard Protects Against Tooth Fracture When Cutting Nails Between Studs And Joists. Fang Tip Delivers Fast Plunge Cutting For Window Cut-Outs. 1/2" Universal Shank.