I dunno that I trust these things at all... Rubber Boots used one to tighten the nuts on his tires after we replaced the front wheel bearings and well we took a drive after that..... the tire came off :| .... rolled through 68th Ave intersection (not sure about the street McKnight or 16th - don't judge me im not from calgary lol) - I had to go chasing it lol... but it was funny none the less....