14mm Spark Plug Caliper, Spark Plug Gap Tool Universal Spark Plugs Gapper Gapping Kit - Blue

Very nice simple tool, just a pro tip for the beginners of this tool or any gap adjusting tool. If you're shooting for .020" do not put in a .020" shim and crank on the tool you'll marr the plug and may destroy it buy pushing the electrod through the porcelain, simply put a -.014 or -.015 smaller than target shim and lightly crank on it. It will spring back to .020 Good luck

Great product! Worked perfectly for gapping my spark plugs!

The product look good, but it is easy to use, heavy and rugged, best value for money.

Works good just a little hard to turn with arthritis in my hands

Does not adjust Stihl chainsaw plugs, had to replace adjusting screw with a longer one but other then that it seems to be an ok tool.see photos

This worked great for me. The one problem I had was when I had the spark plugs all the way in the gap of the plug was at an angle to the gap of the tool. Ideally the gap of the plug would have been facing directly out, which would have increased easiness, but I was able to work with this problem anyway. The tricky part for me, was to figure out how much smaller shim should I put in than my goal gap. My goal was .043 in and I think I ended up using .037? but it might have been smaller than that. I also liked this cheap tool from Lang for opening up the gap safely on platinum and iridium plugs. https://www.amazon.com/dp/B002YKMCDW?ref=ppx_yo2ov_dt_b_product_details&th=1

Pretty basic capper. Easy to use

No frills just works