Bright 12 V interior dome light used for general illumination Features nylon switch and polycarbonate lens Lens attaches to metal base and unit surface mounts with screws Mounts on 3-1/2 in centers Separate ground and lead wires supplied for electrical connection Interior dome lights surface mount carded light clear color Features durable Lexan lens and nylon push-button on/off switch for long life. Separate ground wire supplied for mounting on non-metallic surfaces. 4- 9/16 inches W x 1- 3/4 inches H x 1- 3/4 inches D mounts on 3- 1/2 inches x 1- 1/2 inches centers.