Leviton High Output T8 T12 Fluorescent Light Lamp Holder Socket Plunger 13550 Quickwire terminals accept No. 18 AWG twisted and tinned, solderdipped, as wall as solid leads  stripped 3/8" to 1/2" Slide-wipe horizontal contacts on both ends are silver-plated copper alloy Measures 1.91" tall by 1.44" wide Slide-On fixture Shallow Base