12 Piece, Reciprocating Demolition Set, Includes Blades Engineered To Rip Through A Wide Array Of Materials With Ease Including Structural Steel, Lumber, Pipe NailEmbedded Wood, Set Includes 3 6 6TPI, 3 6 14TPI, 2 9 14TPI, 2 9 6TPI 2 9 10TPI Blades, Power Blast High Speed Blasting Along The Cutting Edge Strengthens The Blade To Reduce Breaks Increase Durability, Patented T2 Technology Reduces Cutting Forces On Each Tooth Optimizes Chip Removal To Allow Efficient Cutting, Taller Thicker Blade Profile Prevents Bending Provides Maximum Control