1" x 18", Hex Shank Flat Chisel, General Chipping Work, Continuos For Heavy Duty Use, For All Rotary Hammers & Demolition Hammers With Spline Or 3/4" Hex With 21/32" Round Tool Holder, Wide Chisels With Two 60 Degree Cutting Angles Clean Concrete, Scale & Rust, Cuts Troughs & Some Asphalt.