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 & 30mm or 4 digit) (40mm) resettable combination: Set your own PIN. Corrosion resistant anodised coating: Long lasting security. 9 modern attractive colours: Good looking security. Outer Measurement: 20 / 52 / 14 (Size mm). Shackle Measurement: 9 / 22 / 3 (Size mm).