satin chrome / polished brass / polished chrome double dimmer switch screwless SF2172 This is a 2G 2 way leading edge dimmer with a 2 x 40-400W rating. With push on/ push off control. For controlling mains lighting add up the wattages of the bulbs you wish to dim. For low voltage lighting add up the rating of the transformers you wish to dim for compatibility. Made from high quality ultra slim, premium grade material. Complete with integral gasket. Compliant to all relevant British safety standards. Minimum mounting depth: 25mm. Dimensions: 87.5mm x 87.5mm. Supplied in retail blister with full fitting instructions. 15 year guarantee.