Effective on hard and soft shafts, Two piece clamp on collars come apart in two halves for easy installation and maintenance Design fully engages the shaft without any marring Provides 360 degree of clamping force Easily installed where major disassembly would otherwise be required Aluminum is lightweight and corrosion resistant Aluminum Double Split Clamping Collar, 1-1/4" Bore Size 2-1/16" OD With 1/4-28 x 3/4 Set Screws