407R - Bonnet fastener, twist to release - 'R' for Riley embossed

Chrome finish on brass, tee shape twist handle fastener with 'R' embossed into top. Push top down against spring to engage hook, turn through 90 degree to release. Lever top 52mm long, angled base approx 45mm diameter with four fixing holes. Height fitted 95mm. Mounting hole centres approx 27mm horizontal, 23mm vertical