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The Master Lock No. 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 2in (51mm) diameter and 1-3/4in (44mm) tall. The horse-shoe shaped retrofit base allows use with raised nameplates and off-center installation to accommodate rotary switch knobs and clear bases and cover allow visibility of nameplates and labels.