Material: Plastic Product detailed size: single product length 58mm width 45mm. height 60mm Transparent rubber head bore: 15mm (suitable for tightening 5/8" taps) joint inner hole: 9mm, outer Materialdiameter: 12mm (suitable for pipe fitting of 1/2 inch inner hole). Screw cap diameter: 18mm (applicable to water pipes with an outer diameter of 18mm or less.)