Feature:1. The coupling uses the tightening force of countersunk bolts to shrink the slit and clamp the shaft tightly.2. The coupling is made of aluminum alloy material, surface oxidation treatment, sturdy and durable.3. The polyurethane elastomer connection in the middle has good waterproof and insulating performance.4. The coupling has a small and compact structure, is convenient to fix and disassemble, and will not cause damage to the shaft.5. The coupling has high accuracy and is widely used in shaft transmission systems of various mechanical equipment.Specification:Item Type: Flexible CouplerModel: GMC-25 x 30Quantity: 3pcsOuter Diameter: Approx. 25mm / 1inLength: Approx. 30mm / 1.2inInner Hole: Approx. 8mm / 0.3in, 8mm / 0.3in8mm / 0.3in, 10mm / 0.4in10mm / 0.4in, 10mm / 0.4in12mm / 0.5in, 12mm / 0.5inTightening Screw Torsion: 1.5N.MRated Torsion: 10N.MAllowable Eccentricity: 0.1mmAllowable Deflection Angle: 1Allowable Axial Deviation: 0.2mmMaximum Speed: 10000PMStatic Torsional Stiffness: 90N.M/RADMoment Of Inertia: 5.0 x 10^-6KG.M2Material: Strength aluminum alloyElastomer Material: PolyurethaneSurface Treatment: Anodic oxidation treatmentFeatures: Intermediate elastomer connectionAbsorb vibration, compensate radial, angular and shaft deviationOil resistance and electrical insulationClockwise and counterclockwise rotation characteristics are exactly the sameThere are three different hardness elastomersClamping screw fixing.Package List:3 x Flexible CouplerNote:Carefully compare product size differences, beware of mistakes.