These sockets are an easy way to strip bolts/nuts.
I work with a guy that uses that socket. He likes his.. Instead of having 4 different ratchets with 4 different sockets to remove or replace small hardware he opts to carry just that in his tool tray while working aloft.. I havent used one myself but if it works then thats all you need. Obviously pro mechanics wont be a fan of it but i think it could be helpful in some situations

they're typically used in my industry to weld to the bolt or nut to remove it.
the extra pins act as air diffusers, not unlike the air gap in a generator welder to modify the arc to give it better characteristics. works best if you find a tree to attach your ground to - gives the best connection to the earth for a weld known only as "thor's asscrack" - unbreakable
You better be prepared if you going to attempt this weld, life threatening, only can do it once. Too risky.... I'm out... 
I have one that my mother gave me for Christmas a long time ago (probably when it first came out). I don't think I've ever used it, but I keep it around just in case I ever need it for something strange.
oh I should say I always thought I'd keep it around for the super odd fasteners, like the 5 pt fasteners on utilities like water company covers. Never actually tried it for that though LOL
oh I should say I always thought I'd keep it around for the super odd fasteners, like the 5 pt fasteners on utilities like water company covers. Never actually tried it for that though LOL