Lenox hand hack saw blade has a shatter-resistant bi-metal construction that allows blades to bend and flex without breaking. Its T2 technology delivers up to 100 percent longer blade life than the prior generation of Lenox hacksaw blades. Blade measures 12 inch x 1/2 inch and cuts through tough metals such as black pipe, unistrut, copper pipe, hardened steel, threaded rod and rebar. Blade with 24 TPI is designed to cut both ferrous and non-ferrous metal. Bi-metal constructionSpring steel backVirtually unbreakableShock resistantHigh heat resistance24 tpi12 in. x 1/2 in. x .025 in.