Climax Metal C-025 Shaft Collar, One Piece, Set Screw Style, Zinc Plated Steel,, 1/4" Bore, 1/2" OD, 5/16" Width, With 10-32 Set Screw Effective on hard and soft shafts Cost effective collar design Easily installed where major disassembly would otherwise be required Tolerance: +.0005/+.0025 No plating for corrosion resistance