Master Lock S2005 Compact Plug Prong Lockout features a compact design to lock out smaller plugs easily and effectively. • Plug lockout grips prongs of 110-120 volt plugs and fits two prong plugs with and without ground. • Accepts 3/16″ (5mm), 1/4″ (6mm) and 9/32″ (7mm) shackle diameters to use with your existing lockout padlocks or lockout hasps.