* Fits 250W HQI lamp * Spring Loaded, German Made, Sold in pairs * Sockets made of corrosion/heat resistant resin, not plastic. * For the true do-it-yourself hobbyist! This loose set of sockets is sold without the mounting bracket, so make sure you have the proper distance when mounting them. * Approx single socket dimension: 1.8" high, 1.5" long, 2" wide socket base. * Sockets are rated for 5KV pulse. * When mounting HQI-250 bulb into this socket, make sure not to touch the quartz sleeve with your bare hands. All fingerprints should be wiped off with a clean cloth soaked with alcohol. * Do not mount without a UV filtering glass shield!! This bulb will put out UV radiation which can damage your eyes and skin, as well as your animals in the tank. The bulb MUST BE burned behind a protective glass sheet.