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SPLINE SPECIFICATIONS: Inside: 20 Spline Fits on 7.6mm Spline. Outside: Spline 20 Spline 7.6mm EXTENDS CARTRIDGE LENGTH: Designed to fit onto the spline of a tap or shower cartridge, extending the length by 13mm when fitted. STACKABLE DESIGN: Multiple extenders can be stacked together to achieve the desired extension length, offering flexible installation options. SHAFT DIMENSIONS: The shaft diameter below the spline measures 10mm FIXING REQUIRED: An M4 screw is required for secure installation; please note this is not included.