Frank, that looks like another part you're gearing up for production to make in quantity. Seems using grade 8 bolts gives uber quality, without any heat treat operation. Seems like a quick way to setup to drill across the center of round bar. And you don't have to put in a centering drill to start out, I like that, no tooling changes. I assume the drill press vise is hand positioned to center the chucked up drill bit into the fixture's hole.