Diablo, 5 pack of 4" 10 TPI high carbon steel T-shank jig saw blades for reverse cuts in wood. Diablo's high carbon steel jig saw blades are specifically designed for high-performance cutting in reverse cutting applications. A high carbon steel cutting edge provides fast and effortless cuts in soft materials. Optimized reversed tooth design for clean top finishes. T-shank design fits all combo and most U-shank cordless and corded jig saws.