The Pigtail Plug Safety Shims, No. 92000, from Ken-Tool are easy to install. The Pigtail Plug Safety Shims are designed to firmly hold the plug in the receptacle to ensure that the plug is engaged, and a vehicle’s lights stay on. The Pigtail Plug Safety Shims prevent lights from flickering during travel and keep ABS lights indicating properly. The Pigtail Plug Safety Shims also prevent prongs from wearing, which prolongs the life of the plugs and the receptacles.