OL57 has been for several ten years the hydraulic press preferred by the dental laboratories and its success remains unchanged, in spite of imitation. OL57 is the oildynamic hydraulic press suitable for all the dental mechanic laboratories, and it is essential when high quality and continuous working results must be obtained. The press OL57 has been so dimensioned as to work with half of its max. load applied: the pressure exerted at 200 Atm is 8000 Kg, while its max. load at 400 Atm is approx. 16000 Kg. In case the pressing load exceeds 8000 Kg, a pressure relief valve goes into action in order to insure highest safety.