1/2” Drive: M16 (Tamper Proof), M18 (Tamper Proof). 1/4” Drive: M4, M5, M6. Extended Reach - Our extra-long Triple Square Bit Socket Set is a must-have when you work in hard to reach areas. XZN/Triple Square fasteners are commonly found in critical applications such as Cylinder head bolts, Retaining Bolts, Drive train components, Door hardware, Disc brake calipers, and more.
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