1-3/8" Square Bore Shaft Collar Two-Piece Split Clamp Type, SteelUsed on square shafts Can be placed anywhere on shaft Smooth bore protects shafts from damage Superior holding power over set screw type collars Exclusively stocked by Stafford, these collars fit on standard square shafts. They can be modified (drilled, tapped, welded, etc.) to act as mounts for other components. 2 Piece Clamp Type Shaft Collars can be completely disassembled and placed anywhere on a shaft. They are precision machined, non marring,