I countersunk it 2″. I bought this to work on my Doodlebug and minibike Engines and was so impressed, I had to show you. That’s a metal gear housing to. And its got a one hour smart charger so your not gonna burn your battery up forgetting it on charge.. Battery life is the best yet. What a deal for $32 with coupon. Cons: Still need the Ingersoll Rand twin hammer air wrench to break the head bolts and flywheel nut/ meaning use what you got now. Thanks for watching