These zarges speedy tower additional individual packs have elements to increase the overall working height of an existing 3t speedy tower there are three packs available please be sure that the correct one is selected following is a list of existing speedy towers and the packs they use product code platform height m max working height m pack combinations speedy1003t 095 295 1speedy2003t 180 380 1 43 2speedy3503t 350 550 1 43 2 43 3speedy5003t 515 715 1 43 2 43 3 43 4 example if you h