Master Keyed lock includes 2 change keys to operate the lock. Uses ESP Master Key K/BES8M-1250 (Sold Separately). This lock uses wafers with 2 different depths. One side of the wafer is operated by the Change Key and one side is operated by the Master Key. 1-1/8" long cam lock keyed differently and also Master keyed. Parts included in bag allow for 90 or 180 degree rotation, restricted key pull, straight or offset cams.