Feature 1. The standard clamp attaches two 1-inch diameter balls ( puts 2 ball together ) 2. Compatible for 1" ball arms for TLC, CamDive, Ultralight and so on 3. It can rotate 360 degrees, versatile, practical, powerful. Standard clamp used to attach two arm, base adapters and strobes together 4. The Butterfly-type Clamp mount is useful for connecting the diving flashlight arm and the GoPro cameras or diving flashlight Package 2 X 1" ball clamp