Brand: AutomationDirect Item: Encoder coupling For Use With: JTEKT TRDA-20 and TRDA-25 series encoders Length: 25.4mm Body Material: Aluminum alloy Bore: 3/8in Attachment Style: Setscrew AutomationDirect encoder coupling, 3/8in bore, aluminum alloy body, setscrew. For use with JTEKT TRDA-20 and TRDA-25 series encoders.