I only got this to replace a rocker cover that needed a deep head with a full 8mm dia full bore and that works great. You can go 8.12mm end to end and that is more than enough to properly seat the full engagement ratchet bolt. No drilling, no frills, but a bit pricey for a single socket. On the other hand I saved a ton of money on dealer work I didn't have to pay for and got 10mm more next time.
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