Sharpened gripping edges designed to extract star and Torx fasteners that are stripped, rusted, painted or otherwise unable to be removed with regular star bits. Chrome vanadium steel sockets and S2 steel bits for strength and durability. Chrome nickel finish resists corrosion. Includes 4-1/4 inch (110mm) steel socket storage rail. 1/4 inch Dr. sizes: TE10, TE15, TE20, TE25, TE27, TE30, TE40.