Height adjustable: 185mm to 240mm. The heavy duty single step is 'new to the market' with the added feature of an adjustable height on each leg. Non slip top. Size of top: 480mm x 370mm. AB30 - AB38, AB44 - AB56, FK17 - FK21, G83, IV1 - IV63, KW1 - KW14, PA21 - PA38, PH18 - PH50.