For conveniently carrying multiple 100mm dia. gas cylinder bottles.Suitable for sizes AD, CD, DD, PD, RD, ZD, D & E.All black decks, made from 12mm thick, impact-resistant polyethylene, for strength and low noise operation.Zinc plated steel tie bolt fixings and handle (double handles on 6 & 8 cylinder sizes) .Blue and red top deck (for empties) available on request.