4"/100mm Xzn Triple Square Spline Socket Bit

4"/100mm 10pc XZN Triple Square Spline Socket Bit. 10pc XZN triple square bit socket set includes Q: What's the d ifference between XZN- Triple-square spline and 12 points spline bits?. The triple-square, also known as XZN, is a type of screw drive with 12 equally spaced protrusions, each ending in a 90° internal angle.