5 Pack, 8", 18 TPI, Reciprocating Blade, Matrix II Steel With 8% Cobalt For Maximum Durability, Tough Flexible Body Resists Breaking, Reinforced Tooth For Increased Durability & Raker Tooth Minimizes Vibration, +5 Degree Hook Angle For Fast Cuts Through The Toughest Materials, For Cutting Mild Steel Under 1/8", Galvanized Pipe, Aluminum Pipe & Channel.