Flow-Rider
Burner
I have a set in Kingchrome, they are sized in M6 & M8 and so on. Bunnings sell them. I always thought they were called multi spline drives.
http://www.bunnings.com.au/kincrome-23-piece-hex-spline-drive-socket-set_p6122315
http://www.bunnings.com.au/kincrome-23-piece-hex-spline-drive-socket-set_p6122315