All sockets for a socket wrench are smooth steel cylinders. The first thing you learn when you're using tools is to set them down on-end, so they don't roll all over the place. That's why I was interested to see Triangle Tools' Uni-Grip Sockets, which have little ridges on them so they can be set down any which way, or so that if they get knocked over they hopefully don't roll too far.
Never heard of Triangle Tools? Me neither, not until recently; around half a year ago someone started posting their tool commercials on YouTube, as below, but I hadn't heard of them again until recently. Now Toolguyd has a review up of Triangle's Nano-Ratchet, which differentiates itself from the competition through greater manufacturing precision; the tool is basically anti-slop, as Triangle has worked out most of the play with finer internal teeth. This means that you can get some torque going with a minimum of wiggle room, which comes in handy when you're working in tight spaces.
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