A spline socket is designed to tighten and un-tighten spline fasteners but is also ideal for use on 4-point, 6-point (hex) and 12-point (bi-hex) fasteners, making them a useful socket to use across multiple shaped fasteners.

Is spline same as Triple Square?

XZN and triple square are the same thing,if you try and use a Torx bit to remove these you'll almost certainly damage the head of it,as not only are there a different number of splines,they're also at a different angle to Torx bits.

Are 6 point or 12-point sockets better?

Answer: It's true that 12-point sockets are fine for most lightweight repairs, but heavy wrenching calls for a six-point socket. A six-point socket is much less likely to slip off a stubborn fastener or round over the corners. Here's why: (1) Six-point sockets have thicker walls, so they're less likely to flew.