The AX Demolition Sawzall Blade is designed to reduce bending and breaking. Bi-metal blade is wider and thicker than standard blades yet fits all reciprocating saws. Nail Guard offers a unique design that protects against tooth fracture. Fang Tip teeth bite into wood on first contact and are made of Matrix II bi-metal for greater durability. 1/2" universal shank. Ideal for plumbing, remodeling, and demolition work.