ASTA A-B03P was developed to remove or install BOSCH injection pumps. All three sockets come with a 1/2″ square drive. 1x Socket triangular to loosen the cover screw – total length 37.8mm, 120 degree thread angie – inner size 14.4mm 1x Socket Triangular to Release The From The Gauge-Total Length 42.1 mm, 120 degree thread angle – inner size 28.1 mm 1x Lock Nut socket for the Control Valve VP37 – Total Length 80.4mm inner size 12.4mm This system from BOSCH is also used at the VAG-Group