Key Features : Finger Proof protection for IP 20 protection against accidental contact, Captive 'never to loose screws', Tunnel terminal preventing screwdrivers from slipping, Laser marking on mechanisms. Arrow showing the correct orientation of the mechanism, The latest IS 3854:1997, Fully shrouded internal mechanism under the rocker preventing visibility of sparks, Sockets are shuttered for child's safety against electric shocks, Size : 22.5 x 45 mm