36mm (about 1 7/16"), 6-point Oil Filter Canister Socket Wrench. Ford: F250, F350 6.0 Turbo Diesel. And other 36mm 6 point oil filter canister/housings. 3/8" socket driver in center and 3/4" or 19mm boxed wrench around it will allow you to also use ratcheting wrenches.
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