Bosch T321AF3 3-Piece 5-1/4 In. 21 TPI Speed for Metal T-Shank Jig Saw Blades For pipes, profiles, and sheet metal 10to 16 gauge, thin metals 1/16 In. to 1/8 In. thick (ferrous and non-ferrous), pipes less than 2-1/2 In. diameter, tube stock, angle iron 21 TPI tooth design for smooth, very fast cuts Bimetal construction for durability and long life Extra-long 5-1/4 In. overall length, 4-1/4 In. working length Proper lubricant is recommended when cutting metal