Specification Brand : Sinoblu BulletPoint1 : Size:D40mm x L50mm/1.57inch x 1.96inch, Bore Diameter: 12mm to 20mm / 0.47inch to 0.79inch BulletPoint2 : Material: Made of aluminium alloy material, light, anti-oxidant, and anti-corrosive, delicate CNC cut with outstanding appearance, high precision fine workmanship,long service life BulletPoint3 : Feature: Screw Type(Coiling Clamping),They are not easy to loosen,Main Color: Silver tone BulletPoint4 : Function: Provides torque transmision and alignment, Cost effective coupling design BulletPoint5 : Widely Used: Used for transmit motion and widely used in DIY model such as small CNC machines, 3d printer Z shaft coupling , car or boat etc. as connector for different parts as joint connector Color : Blue ExteriorFinish : Silver ExternallyAssignedProductIdentifier1 : 781711082485 ExternallyAssignedProductIdentifier2 : 0781711082485 ExternallyAssignedProductIdentifier3 : 00781711082485 ItemName : Sinoblu Shaft Coupler Connector D40 x L50 12mm to 20mm Bore Rigid Coupling Stainless Steel Rigid Couplings for 3D Printers ItemPackageDimensions_Height : 10.9982 centimeters ItemPackageDimensions_Length : 1.7018 centimeters ItemPackageDimensions_Width : 9.2964 centimeters ItemPackageQuantity : 1 ItemTypeKeyword : set-screw-couplings Manufacturer : Sinoblu Material : Aluminum MetalType : Aluminum MetalType1 : Stainless Steel MetalType2 : Aluminum ModelNumber : ASSCDS NumberOfItems : 1 PartNumber : HC-JL-GX-4050-12-20 ProductDescription : ✔This set screw shaft collar is made of solid 304 stainless steel, The setscrew-type shaft collar has improved holding power when the shaft material is softer than the setscrew material which supporting low axial loads and simple positioning. Good axial and radial support performance. ✔This shaft collar Comes with a socket cup-point setscrew for securing the collar onto the shaft. ✔Suitable for nearly all types of machinery and industry, such as drive shafts, agricultural implements, medical equipment, gearbox assemblies, motor bases, machine tools, and paper and steel mill equipment, the automotive industry, the manufacturing industry, the hobby craft industry.