Since 1968 this style of Keson steel tape has been providing customers with accurate measurements. They are used in the harshest conditions in which people measure, and they stand to the only test that matters: field performance. The nylon-coated steel tapes are constructed with a double layered .2mm nylon, permanently bonded over a center core of 9.5mm steel. Our multi-layer construction assures corrosion resistance (even to salt water) and provides at least three times the usual tape life.