Ruland RSS13-5/16"-5MM-A, 0.313" X 5mm Short Slit Coupling, Aluminum, Set Screw Style, 0.787" (20.0Mm) OD, 1.024" (26.0Mm) Length

Ruland BC21-10MM-3/8"-A, 10mm X 3/8" Bellows Coupling, High Stiffness, Aluminum, 1.313" (33.3Mm), OD 1.700" (43.2Mm) Length

Ruland MJSC41-16-A, 16mm Jaw Coupling Hub, Aluminum, Set Screw Style With Keyway, 41.3mm OD, 18.0mm Length

Ruland BCK16-3/8"-8MM-A, 3/8" X 8mm Bellows Coupling With Keyways, High Stiffness, Aluminum, 1.000" (25.4Mm), OD 1.345" (34.2Mm) Length

Upgrade D25L30 Flexible Shaft Coupling 8mm To 8mm Aluminium Plum Connector Flexible Coupler For 3D Printer CNC Machine And Servo Stepper Motor

Ruland MRSS8-3-2-A, 3mm X 2mm Short Slit Coupling, Aluminum, Set Screw Style, 8.0mm OD, 11.7mm Length