Climax Part C-018-A, Aluminum, Set Screw Collar, 3/16 inch bore, 7/16 inch OD, 1/4 inch Width, 8-32 x 1/8" Set Screw Effective on hard and soft shafts Cost effective collar design Easily installed where major disassembly would otherwise be required Tolerance: +.0005/+.0025 Aluminum is lightweight and corrosion resistant