Brand: AutomationDirect Item: Encoder coupling For Use With: JTEKT TRD-MX series encoders Length: 19mm Body Material: Aluminum alloy Bore: 4mm to 3/16in Attachment Style: Setscrew AutomationDirect encoder coupling, 4mm to 3/16in bore, aluminum alloy body, setscrew. For use with JTEKT TRD-MX series encoders.