Climax Metal H2C-087 Shaft Collar, Two Piece, Black Oxide Finish, Steel, 7/8" Bore, 1-7/8" OD, 1/2" Width, With 1/4-28 x 5/8 Set Screw Two-piece clamping shaft collar for applications requiring a stronger holding power and higher axial load capacity than setscrew or one-piece clamping collars Recessed screw head provides an exterior profile free of major projections for increased safety Steel for weldability and rust resistance with a black oxide finish for a decorative appearance and for resistance to stick-slip, white corrosion, and abrasion Includes socket-head cap screws for securing the collar onto the shaft Operating temperatures range from -17 to 148 degrees C (0 to 300 degrees F)