I carry a metric deep socket set up to 20mm, a standard deep set up to 1"5/8 with extensions and swivels, a few wrenches, pliers, a few torques, screw drivers, wire cutters etc.. I also keep an extra coil, spark plug, and a HeliCoil Save-a-Thread 14mm x 1.25 Spark Plug Thread Repair Kit, a bore scope and an extra serpentine. If I'm gonna be off-roading in the mountains for a couple of days I might add to it, but this is what I always keep handy.