Climax Metal Products C-037-BO $1.15 Shaft Collar, Std, Set Screw, 3/8 in. W | Zoro.com
Shaft collar - Wikipedia
Climax Metal C-031-BO Shaft Collar, One Piece, Set Screw Style, Black Oxide Plating, Steel,, Steel, 5/16" Bore Size, 5/8" OD, With 10-32 x 1/8 Set Screw - Walmart.com
Precision Set Screw Collars | PIC Design, Inc.
Set Screw Style Shaft Collar - China Collar, Shaft Collar | Made-in-China.com