1/2" ID shaft set screw steel collar stop zinc plated 1/2 inch collars (1) pc | eBay
RULAND MANUFACTURING D-Bore Shaft Collar: 1-Piece, Inch, D, Clamp On, 1/2 in Bore Dia, Aluminum
Clamping Shaft Collars (4 Choices)
Chicago Die Casting 1 In. Shaft Collar - Anderson Lumber
Ruland QCL-10-A Shaft Collar, Quick Clamp, 1pc, 5/8 in, Alum
Amazon.com: MECCANIXITY Shaft Collar 1 Inch Bore Single Split Aluminum Clamping Collar Shaft Collars with Set Screw Silver Tone 4 Pack : Industrial & Scientific