Specification Brand : Sydien BulletPoint1 : Bore Diameter:5/16" ,Outside Diameter: 63/64". BulletPoint2 : Effective on hard and soft shafts. BulletPoint3 : Easily installed where major disassembly would otherwise be required. BulletPoint4 : 2 pieces clamp on collars come apart in 2 halves for easy installation and maintenance. BulletPoint5 : 2pieces clamping shaft collar for applications requiring a stronger holding power and higher axial load capacity than setscrew or one-piece clamping collars. Color : Dark Grey ExteriorFinish : Black Oxide ExternallyAssignedProductIdentifier1 : 0745128554713 ExternallyAssignedProductIdentifier2 : 745128554713 ExternallyAssignedProductIdentifier3 : 00044861125120 ItemName : Sydien 2Pcs 2Piece Clamping Collar Set Style Double Split Shaft Collar 5/16" Bore, 63/64" OD ItemPackageDimensions_Height : 12.9 centimeters ItemPackageDimensions_Length : 1 centimeters ItemPackageDimensions_Width : 9.7 centimeters ItemPackageQuantity : 1 ItemTypeKeyword : clamp-on-shaft-collars Manufacturer : Sydien Material : Aluminum MeasurementSystem : Imperial MetalType : Alloy Steel ModelNumber : 2C-112-A NumberOfItems : 1 PartNumber : 2C-112-A ProductDescription : Features 1. Made of durable aluminum alloy, which is resistant to abrasion. 2. 2pieces clamp on collars come apart in 2 halves for easy installation and maintenance. 3. Effective on hard and soft shafts