CB2-200 2" ID Double Split Clamping Shaft Collar, Black Oxide Finish Bore: 2" Outer Diameter: 3" Width: 11/16" Screw: 5/16-24 Weight: 11.7 oz each Two-piece Clamping Collars are designed for applications that require greater axial load capacity than Set Screw and One-Piece Clamping Collars without marring the shaft. Two-Piece Clamping Collars are available with special quotes for a keyway for keyed shafts. Two-piece, also known as Double Split Collars are available in Black Oxide finish, Stainless Steel, Aluminum, and Zinc plating.