The Master Lock S2151 Removable Push Button and Rotary Switch Cover prohibits access to a switch or control. The cover fits both 30.5mm and 22.5mm diameter switches and accommodates buttons up to 51mm diameter and 44mm tall. The horse-shoe shaped retrofit base allows use with raised nameplates and off-centre installation to accommodate rotary switch knobs and clear bases and cover allow visibility of nameplates and labels.