The PT52 is engineered to be one of the lightest and fastest tools of its type on the market. The exceptionally compact 52mm diameter gearbox means that the tool is well balanced, light weight and provides excellent access to bolts. "Internal Regulator" versions are fitted with a regulator in the air inlet tube. Customers with suitable calibration equipment can set the torque output by adjusting the air regulator. The tool can then be run direct from the air supply without a 'Lubro Control Unit'. These tools are supplied with an air pressure graph which will apply only when the regulator is in the fully open position.