Laboratory jacks aluminium for those who wish to reach the top new design and improved construction: Improved scissor technology with reduced tolerances. Ergonomic knob rounded and user friendly. Scissor construction made of 18/10 stainless steel. Properties: All models are manufactured according to DIN 12897. With the operating load we differ between the maximal dynamic operating load (Kg max. dyn.) and the maximal static operating load (Kg max. stat.) of the lab jack. These norms are also according to DIN 12897. Smaller models up to 240mm x 240mm (Type A) have a simple adjusting wheel which can be operated by hand. Bigger models from 300mm x 300mm on (Type B) have a special adjusting wheel which is used with the included ratchet.