DIVEPRO butterfly clamps
Z02A 2-hole butterfly clamp - this is the standard butterfly clamp
Z02B 3-hole butterfly clamp - this allows attaching two ball joints to mount more lights/strobes on the same arm.
Z02C 2-hole butterfly clamp long with shackle - this is for heavy camera setups and provides a shackle to attach a strap to so you can lift the camera by the strap which will equalise the weight over the two shackles.