These DeWalt circular saw blades are designed for use with stationary machines to cut softwoods and composite materials.Their fast, smooth cutting action and durable construction make them ideal for demanding onsite operations. The wedge shoulder protects the carbide from nail impact. Replaces DT1155 Features and Benefits Extreme Runtime Accessories optimized for Flexvolt. Nail Tough � perfect for cutting through nail embedded wood Increased efficiency for maximum cordless run time 2X life versus standard construction blades plus additional runtime / cuts per charge with Flexvolt battery FV tool) Ultra-thin kerf design for Smooth Cuts; fast cutting, low cutting force, smooth cuts This DEWALT Construction Circular Saw Blade is for the cutting of rough timber, possibly with embedded nails. Specification: Blade Diameter: 216mm Blade Bore: 30mm Tooth Count: 40 Plate Thickness: 1.7mm Kerf Thickness: 2.6mm Grind Type: ATB Rake Angle: -5�