The SOG chairs are an economical, lightweight, easy to use alternative to metal chairs with bases in deep slab situations, with no voids under the bar or mesh and no rust problems. The easy clip-on system ensures the chair stays in place whilst the integral base saves time and labour placing separate bases. Ideally suited to commercial and civil projects such as deep slab on ground and road ways. The chairs have been load tested to exceed 500kg, and are available in 95, 100, 110, 120, 130, 140, and 150mm cover for bar or mesh up to 20mm.