The stanley power lock top reader tape has a clear viewing window on the top of the case ideal for those taking internal measurements on a regular basis as the length of the case is taken into account by the measurement you see within the viewing window its mylar coated steel blade with metric graduations that is up to 10 times more resistant to abrasion than normal lacquered blades tipped by a super strong 3 rivet automatically adjustable tru zero end hook supplied in a high impact chrome plat