ASTA A-P115 is air powered CV boot fitting gun tool designed for stretching flexible CV boots onto the drive shafts. You don't have to remove the CV joint and prevents damage to the drive shaft. It has standard 1/4" BSP connection and works at 72-113 psi (5-8 bar) with max air pressure of 9 psi (9 bar). Comes with CV joint diameter range of 20-115 mm. To be used with professional air compressors. Simple to use and save a lot of time.