2 Pack, 9", 8/10 TPI, Diablo Steel Demon, Reciprocating Blade, Bi-Metal Liquid Metal Tooth Design, Lasts Up To Four Times Longer Than Standard Blades, For Cutting Steel & Metal Composites 1/8" x 1/2", Features Perma-Shield Non-Stick Coating & Liquid Metal Technology For Maximum Durability & Speed, Specifically Designed For Maximum Performance In Metal.