| 1/8/2018 1:05 pm A nifty tool by Richard This does look like a good idea. I was browsing my local hardware store when I came across nut drivers and thought of my Polymer 80 build. I picked up a 3/16" driver and thought I was golden for paying $3.99. When I got home I realized the driver had a slight chamfer on the end of the socket, which would mean the thin Glock front sight screw head would spin in the socket towards the end of the installation. The tool pictured does not appear to have a chamfer. So I got the Dremel and ground down to remove the chamfer. The deep socket allowed plenty of room. Then I realized the driver diameter was ever so slightly larger that the circular depression in the slide. So, back to the Dremel to grind around the circumference of the nut driver to reduce it to fit the depression. Bottom line: My hardware store tool worked just fine. Go that route if you want to grind and save 6 bucks. I recommend getting this tool.