Well made, working perfect
I have a 1-3/4" thick maple top on my bench with 3/4" dog holes.  The holdfast works perfect although I did have to scuff up the vertical portion with a rough file (2 minutes total).  I learned from the maker to use a heavier hammer, so I tried a larger ball peen hammer and hit it more on the front top rather than on top closer to the vertical.  The hold down portion is sitting flat against a 3/4"board as well as thicker boards.  It is working great and Bill, the maker, responded quickly to my inquiries.  Product arrived about a week earlier than expected.  Enthusiastic 5 Stars for this.  Plus hand made in Albuquerque, and local (for me I mean).
Rating: 5 stars