Features - Front-side retrofitting of QuickFlex lighting modules without removing the switch. Front-side measuring and test contacts, accessible without removing the switch. Quick-thread screws for claw fastening. Countersunk claws with return spring. High-gloss galvanized support ring insulated from the claw. With claw and screw fastening. With plug-in terminals. To be completed with rockers for switches/push buttons System M.