This set has everything needed to easily remove vacuum switches, oil pressure sending units, brake light switches, and oxygen sensors on most car models. Set includes: 29mm pressure/ vacuum switch socket, 7/8 inches vacuum switch socket with 7.5mm gap, 27mm oil pressure sending unit socket, 7/8 inches vacuum switch socket with 20.6mm gap, 1-1/16 inches and 1 inches oil pressure sending unit socket, 7/8 inches short oxygen sensor socket, 7/8 inches hex, 1/2 inches double square driver.