Used this CH-60 punch to cut 3/4" holes in guard rail post with 2510A Air/Hydraulic pump. It does a good job snapping holes in 3/16" steel with a nice loud ring. Neighbors a half mile away asked what that popping noise was.
With that said...If you use this unmounted (as holding it on its side punching holes in vertical metal) be prepared to use your muscles. At 38.7 pounds it is a substantial weight to hold in position repeatedly. If it were lighter, It would not work have strength to push a steel punch through another piece of steel. Will have a few hundred plugs before finishing. I can use 3/8" punch to turn them into heavy washers. I'm happy with purchase.