Cooper Wiring Push Canopy Switch. Standard metal canopy switch with push-button operation. Superior switching action. Small flat Bakelite housing measures 1" L, 5/8in W, 7/16in H over lock nut. Standard shank threaded 3/8-27 x 3/8in L allows mounting clearance on 1/8in maximum thickness of mounting shell. Matching hexagonal lock nut and decorative knurled outer nut prevent rattling when #18 (221deg. F) black plastic wire 6in long, stripped 3/4in. Non-removable metal knob. Carded.