I 've got both the 3/8 and 1/2 Snap-on---The truck guy loaned me 1/2 for a week and it was really great---was doing several cylinder hone and align hones that week---it worked super--- I didn't buy it---it was the 1/2 and was pretty heavy, so I bought the 3/8 one as it goes high enogh for most head bolts-- Later bought a 1/2 but got off e - bay as so many guys were selling there tools after the meltdown-----------got it for about half price---

they work really good especially if you are somewhere that is cramped (under a van hood) and are absolutely the only way to do the crank snot bolt on an ls type engine---before this wrench used to use an 3/4 to 1/2 adapter and just tighten with a pipe til it broke off the adapter aquare!!!!

All kidding aside---if looking at e bay or pawn shops---there are two versions that look alike and very similar---I think the one that has the angles is called atech3fr250 foe the 1/2 drice and atech2fr100 for the 3/8--