2920 Series Steel Set-Screw Collar (12mm Bore) - 2 Pack
Solid Steel Shaft Collars: 1 1/2" I.D.(Inner Diameter), 2 1/4" O.D.(Outer Diameter), 3/4" Width, Zinc Plated with One Set Screw, 136022: Amazon.com: Industrial & Scientific
Aluminum Shaft Collar | 4mm Bore
Shaft Retention Collar - PYI Inc.
6 mm Round Bore Slim Shaft Collar - AndyMark, Inc
Jeremywell 5/8" Bore Stainless Steel Set Screw Shaft Collar OD 1-1/8" Width 1/2" (2 PCS): Amazon.com: Industrial & Scientific
Climax Metal C-200-2H Set Screw Collar, With 2 Holes at 90 Degrees, Black Oxide Plating, 2" Bore Size, 3" OD, With 1/2-13 x 1/2 Set Screw: Setscrew Shaft Collars: Amazon.com: Industrial & Scientific