High speed steel. Side set and ground with progressive tooth spacing. Fast cuts and long life in metal, sheet metal 5/64" to 3/8"; non-ferrous metal 5/64" to 3/4"; stainless steel 1/16" to 1/8", plastics 1/16" to 1-1/4"; fiberglass 3/64" to 3/4".
Bosch Jig Saw Blade, 4 in Length, 0.34 in Width, 0.04 in Thickness, 10/24, Side Set Progressive and Ground Teeth, T-Shank Shank, High Speed Steel Body, Applicable Materials: Metal, 5/64 - 3/8 in Sheet Metal, 5/64 - 3/4 in Non-Ferrous Metal, 3 in Working Length, For Bosch, AEG, Dewalt, Elu, Hitachi, Makita, Metabo, Milwaukee and others Jig Saws