Climax Metal 2C-037 Steel Two-Piece Clamping Collar, Black Oxide Plating, 3/8" Bore Size, 7/8" OD, With 6-32 x 3/8 Set Screw Effective on hard and soft shafts Design fully engages the shaft without any marring Provides 360 degree of clamping force Easily installed where major disassembly would otherwise be required Black oxide provides some corrosion resistance