Climax Metals C-075-DTX20 Mild Steel Set Screw Collar, 3/4" Bore, 1 1/4" OD, 9/16" Width, 5/16-18 x 1/4" Set Screw (Pack of 20) Effective on hard and soft shafts Cost effective collar design Easily installed where major disassembly would otherwise be required Tolerance: +.0005/+.0030 No plating for corrosion resistance