The Kondor Blue 1/4" Ball Head for Magic Arms (Space Gray) can replace the 3/8" version and fits Kondor Blue and most 3rd-party ball joint arms with a 1" diameter ball size compatibility. You can secure various accessories such as monitors to the 1/4"-20 end or you can also secure the 1/4"-20 end to camera cages so you can attach an arm to the ball head. 

A slotted hole towards the top lets you tighten the ball head firmly to your cage by running an Allen key through the hole. This is compatible with most Magic Arms, Friction Arms, and Israeli Arms using a dual ball head system.