Climax Metal MC-08-S T303 Stainless Steel Set Screw Collar, Metric, 8mm Bore Size, 16mm OD, With M4 x 4 Set Screw Effective on hard and soft shafts Cost effective collar design Easily installed where major disassembly would otherwise be required Tolerance: +.0005/+.0025 T303 stainless steel is effective in corrosive environments