Series 20, 6-1/2" 16T/24T Construction Combination Pack, Thin Kerf Blade For Fast Cutting, Anti Stick Rim Reduces Friction & Gum Up, Professional Quality Cordless Ultra Thin Kerf Saw Blades Specifically Engineered To Optimize Cutting Performance & Maximize The Number Of Cuts Per Charge Of All DeWalt 5-3/8" & 6-1/2" Cordless Saws.