DeStaco 624 straight line clamp. These are brand new clamps with 700 lbs clamping force, 5/8" plunger diameter, 3/8" tap hole in plunger end and it mounts into a 1" hole up to 5/8" thick. I used these on conveyors for years and they are very tough. they come with the nut. I opened the package for photos, rest are in sealed package. Grainger sells them for over $60 ea.