The stanley power lock tape has a stainless steel blade and spring for toughness durabililty and resistance to rust and corrosion the blade has a nylon coating with metric graduations both sides of the blade the tru zero end hook enables accurate internal and external measurements and the long standout allows greater reach and versatility the tape features a secure blade lock to hold the blade in position for hands free use making marking easy the case is chrome plated which also has anti rust