Authentic PNC P&C DSLR Camera GearBox GB-3 Video Accessory Cage w/ 15mm Rod The new GearBox can support a full size Canon 5D Mark II inside of the cage without using the included extension adapters. With the extension adapters installed, the GearBox can support the Canon DSLR plus a Quick Release Adapter, or larger camera bodies. metal bottom bracket has (5) 1/4-20 threaded mounts available underneath to attach a quick release plate The top black anodized metal bracket carries (14) 1/4-20 threaded holes and (9) 1/4" pass through holes for mounting a variety of hot shoe adapters, mini ball heads, or P&C Friction Arms.