Vevor 36" excavator thumb exceeded my expectations. Welds appear to be very solid and overall very solid. Everything is square. Some slop in pins/holes but tight tolerances are not needed. I used this on my CASE 580 extendahoe. I welded the smaller 6" mounting pad at the bottom of the inner tube of the dipper arm and the longer bracket to the outer tube. By doing this I can fold the thumb by extending or retracting the dipper arm. I remove it when not using the thumb.