The Oxford Dipper 'C' Socket Fixing:
This socket is surface mounted and stands proud of the floor by 150mm. It is used mainly where there is insufficient depth of concrete for 'A' or 'B' sockets. The 'C' socket plate is drilled for four 15mm Rawplug type expanding bolts. The recommended minimum depth of concrete for the 'C' socket is 150mm. The 'C' socket adds 150mm to the height of the mast. This alters the maximum height of the bottom of the chair to 1039mm and the lowest position of the chair bottom below floor level to 764mm.