This is a set of heavy duty quick connect couplers that are designed to stand up to the most demanding jobs. With a pressure rating of over 5000psi, you can be sure that they are up to the task. Heavy knurled sleeve for non-slip grip. 1/2" NPT female thread (the most common size for skid steer attachments) No air inclusion during disconnection. Flat mating surface easy to clean. Couples to any standard Flat Face couplers on Skid Steers and other equipment. This is the most common size of hydraulic couplers (1/2" body) for skid steer attachments. Check the thread size on the hydraulic hose on your attachments, if its 1/2" pipe thread (most are), then this is the couplers you will need. Works with many models of: Bobcat, CAT, Deere, New Holland, and other skid steer attachments. If you have any questions about size, feel free to ask.