This tool sounds like it will fit MORE 10mm and 13mm bolt heads, but it won't fit over 13mm bolt heads. not even close!. I used it on my 2002 Olds Bravada (4.2L engine) as do most Outriders, Envoys etc so I simply removed 2 bolts (13mm) this tool into the open holes on the water pump pulley plugged in and then backed off the 2 bolts while holding the tool, used my giant adjustable wrench on the fan clutch nut, held both in place and used a little muscle strength. freed! I was so happy! But please revise the instructions! It will NOT fit screws larger than 13mm AT ALL! The tool appears to be very high quality, thick steel, so I really don't know how some people say it's bent and all!
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