GM's late-model mid-sized 4WD's have very little clearance to adjust the camber and caster with the OE adjusting cams. These specially designed adjusters replace the OE adjusters, and feature a 3/8" square drive hole, allowing fast and easy "on the vehicle" adjustments with any standard breaker bar. The unique design saves time by installing onto the OE bolt - and allows for quick future adjustments. California Residents WARNING