Precision extruded, cut & drilled pure aluminium body: Light & strong security. Mechanism & shackle plated: Avoids chemical corrosion often found on other aluminium locks 3 digit (20 & 30 mm. or 4 digit) (40 mm. ) resettable combination: Set your own PIN. Corrosion resistant anodised coating: Long lasting security 9 modern attractive colours: Good looking security. Outer Measurement: 40/81/18 (Size mm) Shackle Measurement: 21.5/27.5/6 (Size mm).