Brand: AutomationDirect Item: Reducer bushing For Use With: JTEKT TRD-NH and TRD-SH series hollow shaft encoders and NEMA size 17 stepper motors Material: Aluminum alloy Length: 16mm Size: 8mm to 5mm AutomationDirect reducer bushing, 8mm to 5mm, aluminum alloy. For use with JTEKT TRD-NH and TRD-SH series hollow shaft encoders and NEMA size 17 stepper motors.