SK makes these. I copied below from an ad. Anyone know anything about them. They are expensive but claim to work for different type of fasteners. I would think they would not be that good for high torque application, like loosening a real tight bolt, because not that much of wrench is contacting bolt.

I have them in 3/8ths and 1/2" Std and Metric and love 'em!

No switching needed and I haven't been able to FUBAR one yet!

SK is one of the few manufacturers that promptly replace sockets and ratchets and refund your shipping as well. The last time I sent in a ratchet for repair, 1/4" drive shorty that I "over stressed" and sheared the teeth off the gear, they were doing inventory so they sent me a new ratchet and 2 weeks later returned the repaired original...at no charge for either one.

I called 'em up and asked where to return the loaner and they said to keep it and thanks for being a loyal SK customer.

To address the "damaged fastener" issue I also have a set of Irwin Damaged Bolt sockets (10 sockets) that cover almost all sub 3/4"/21mm
fasteners. They fit a 3/8ths ratchet but also have 6 flat sides to accept a open end or box wrench or even a 1/2" drive socket with a cheater pipe.
The sharp left hand spiral threads in the tool steel socket bite into the remains of the bolt head, nut or even spline shaft (or broken shank) and provide enough grip to allow you to back the fastener out. Yes, the bolt/nut/spline head is chewed to hell but it is out and you still have the skin on your knuckles...

One of the best $20 I have ever spent.

The tools I'm talking about are the wrenches not the socket, but I suppose they would work the same.

Also do they fit the e-torx bolts on the MB engines, and if so you you get metric or fractional wrenches?