Adapter for 16 pin header Used for 16 pin controller headers (limit, jog, ctrl,…) Works with all controller versions. Compatible with the following CNC USB Controllers: CNC USB Controller Mk3 ( 4 ) axis CNC USB controller Mk3 ( 9 ) axis CNC USB controller Mk3ECO ( 4 ) axis CNC USB controller Mk3DRV ( 4 ) axis