Internal enzie H-S 1880/16 general specificationÊ Standard opening (mm) :Ê 1880 x 1880 mm enzie H-S 1880/16 spiral stair featuring column 101.6 OD x 5mm wall. Treads to be box section made from 2 mm and 1.6 mm mild steel. Handrail will be 19 mm diameter x 1.6 mm wall with balusters 16 mm diameter 1.6 mm wall. Finish and tread selection will be as selected from enzieÕs colour range. Stair to be supplied and installed in accordance to the enzie space saving stairÕs fixing and installation instructions.