Specification Brand : Martin BulletPoint1 : For use with series 40 chain, 1/2” pitch for driver or driven sprocket needs BulletPoint2 : Type BS sprocket with two setscrews and a keyway offers a stable and secure attachment to the shaft BulletPoint3 : Shaft diameter size from 1/2” to 1-1/2” for a variety of applications BulletPoint4 : Varying numbers of teeth, hub sizes, and stock bore sizes offer application flexibility BulletPoint5 : High carbon steel for strength and durability ExternallyAssignedProductIdentifier1 : 697950006130 ExternallyAssignedProductIdentifier2 : 0697950006130 ExternallyAssignedProductIdentifier3 : 0097039327642 ExternallyAssignedProductIdentifier4 : 0097039298706 ExternallyAssignedProductIdentifier5 : 00097039327642 IncludedComponents : 11 Tooth C Sprocket ItemName : Martin Roller Chain Sprocket, Bored-to-Size, Type B Hub, Single Strand, 40 Chain Size, 0.5" Pitch, 30 Teeth, 1" Bore Dia., 5.057" OD, 3.25" Hub Dia., 0.284" Width ItemPackageDimensions_Height : 2.54 centimeters ItemPackageDimensions_Length : 13.34 centimeters ItemPackageDimensions_Width : 13.34 centimeters ItemPackageQuantity : 1 ItemTypeKeyword : roller-chain-sprockets Manufacturer : MARTIN Material : Carbon Steel ModelNumber : 40BS30 1 NumberOfItems : 1 NumberOfRows : 1 NumberOfTeeth : 30 PartNumber : 40BS30 1 ProductDescription : Description: 11 Tooth C Sprocket 5/8 Bore,3/16 Key Way Cut. Fits for 40,41,and 420 Chain. Feature:gear of high temperature quenching heat treatment, high hardness,wear resistance,rust, corrosion resistance. More Top-end speed compared to most stock 10 tooth that come with most Torque Converters. Package Content :1 x Sprocket.