2920 Series Steel Set-Screw Collar (12mm Bore) - 2 Pack
1/4" Set Screw Collar — AllPadlocks
6 mm Round Bore Slim Shaft Collar - AndyMark, Inc
1/8" Set Screw Collar — AllPadlocks
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
Climax Metal C-050-S Shaft Collar, One Piece, Set Screw Style, Stainless Steel, 1/2" Bore, 1" OD, 7/16" Width, With 1/4-20 Set Screw: Setscrew Shaft Collars: Amazon.com: Industrial & Scientific