A combination of 4 Dually / D2 optics into one large sturdy housing with a vibration isolator and 304 stainless bracket included. The size specifications are as followed Height 6.79", Width 6.75" and the Depth 3.42". For use in a heavy duty commercial environment for Agriculture, Fire and Rescue, Commercial truck, Marine, Off-Road and Power Sports. Q-Series covers also include a 50% forward projecting and 50% area light option to project the light where and how you really need it. Designed specifically to function in any environment and withstand any abuse. These LED Lights are big, bright, and heavy duty!