5 Pack, 8", 14 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, Heavy Gauge Metal, Hard Rubber, Fiberglass & Angle Iron.