Jeremywell 3/4" Bore Stainless Steel Set Screw Shaft Collar OD 1-1/4" Width 9/16" (4 PCS): Amazon.com: Industrial & Scientific
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 3/16 in. T303 Stainless Steel Set Screw Collar C-018-S - The Home Depot