It achieves the maximum amount of light output possible for lighting large groups and bouncing light off of high ceilings.<br />With Bowens S-Type mount, compatible with various brands of studio strobe flash lights with Bowens mount.<br />Made of aluminum alloy, study and durable. 45 degree beam of light.<br />The outer diameter of it: 293mm; The inner diameter: 282mm (11 inches); The height: 351mm; The Bowens S-Type three-prong mount inner diameter: 92mm. ">