The Kit Includes 5 Cam Adjusting Holding Tools to Adjust the Control Arm Cams Found on Chevrolet and GMC Vehicles. The holding tool surrounds the entire perimeter of each cam to provide a no-slip work area when moving the hard-to-reach and often rusty OEM cams on 1999 and newer GM 1/2, 3/4, and 1 ton vehicles with coil spring front suspensions. The 14-1/2" long 21mm/24mm wrench can be conveniently used from the bottom side of the vehicle instead of reaching through the wheel well which saves technician's time. Holding tools also work with 27mm applications and can be used with a standard wrench or socket.