Your browser does not support HTML5 video. I have arthritis in my knee (need a knee replacement) and my back. Cutting #4 rebar manually was doable but my structural engineer threw #5 into the mix this year. Cutting #5 manually takes every ounce of energy and really hurts both my knee and back. I just bought this cutter and OMG, this is incredible!!! I should have bought one of these years ago. It zips through #5 rebar in about 2 seconds. Do yourself a favor and by one of these. For just a little more than the cost of a manual cutter, you can totally avoid the aggravation of manual cutting. We're building an off-the-grid ICF medieval castle (Keene Castle). If you screw up a wall measurement and you have to remove some of the ICF block, you may have some bar sticking out of the wall that is still wired in. In this case you can just take the electric cutter to the wall. Can't do that with a manual cutter.