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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
Star Drive Shaft Collar Set Screws, 8-32 x 0.125", 100 Pack for VEX Shaft Collars - Robosource.net