Fotga Dual Head Grip Swivel Head Clamp Clip Holder for Reflector Studio Boom Arm Light Stand Photo Studio Umbrella Accessoires Kits Photography This High quality grip helper adds versatility to any light stand It accepts an umbrella, stud, boom arm, flag, or gobo while mounted to stand Diameter (without hand grip): 77 mm Height (without hand grip): 82 mm Material: Plastic