Consists of 2 step blocks and 2 clamps, 2 nuts, 2 T-slot nuts: B = 7, E = 12, D = 4 and C=7.2mm) secures objects to approx. 35 mm high. May be used with PD 230/E, FF 230/250, PD 400, KT 150 and face plate 24 412 and KT 150. Supplied in wooden box and lid. No 24257