1st socket out the box 38mm, used on tractor implement, split in 1/2 when torqued to break bolt loose. Had to go to Snap-On to break bolt loose. I guess you get what you pay for. I hope it was a defective socket and rest of kit stands up to heavy use. I should have taken a photo but was so pissed, I tossed it. It probably landed in next county. Or I’ll find in 1 day when I’m bush hogging.