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Check the listing for details. Jaw Coupling Center Insert Rubber Spider Insert Vibration-damping Capabilities. Condition: New. Listed at 9.95 USD. Install the jaw coupling and insert it into the L jaw coupling by aligning the splines and pressing it securely into place. 1 x L-jaw coupler Insert. The solid design provides enhanced stability and torsional rigidity, allowing for efficient power transmission and vibration-damping capabilities to minimize wear and tear on machinery components.