Thumb Score: +16

I was shopping for one and found this on sale with decent reviews so thought I’d share. It was important for me that it’d be chain driven with 0 play. Every wrench/socket set should have one. Most sets come with Vertical extenders. This can be described as a Horizontal extender. If you own a Subaru 2.5 Box Engine then this is what you need to be able to change the driver side’s spark plug. I recall a few other cars that needed something like this to remove the spark plug or a bolt. Damaged many a knuckles in my time without this!