About this kit (from Annex Engineering):

Harness to connect two carabiner type boards together. May work with other printers or devices, with some creativity

600mm length is for Tradrack or K3 printers

1200mm length is for K1/K2, Redoubt or Denali printers

IGUS equivalent wire, 16pin molex connectors on each end. Sleeved with black braided sleeving and capped with black adhesive filled heatshrink

If you need the full harness you may wish to also purchase this.