Publisher: Osilly. 【Wide Application】: This has a 3/8″ I.D. on one end for 3/8″ screwdrivers and a 1-1/8″ I.D. on the other end for 1-1/8″ hex wrenches. The total height is 2.95″. It is compatible with GM’s combination light and pressure gauge oil pressure switches for most newer models as well as 91 and 87 models.