The blast machine packages on this page include portable classic-style machines with TLR pneumatic pressure-release remote controls. Pressure-release remote controls depressurize the blast machine whenever the RLX handle is released. Each package includes an Apollo 20 HP DLX helmet for use with ambient air pump as the breathing-air source. All standard 0.5 and 1.0 cuft blast machines have a working pressure rating of 125 psi. Blast machine capacities, stated in pounds, refer to abrasives (such as mineral slag) which weigh about 100 lbs per cuft. Comparatively, steel grit weighs 250 lbs per cuft.