Mayhew Tools Dual Drive 4mm Hex Bit

Features and Benefits: 4 MM Metric Hex Dual Drive Bit 7/16" Drive Precision tip profile manufacture for positive and precise fastener engagement Titanium Nitride coating for added strength and wear resistance Unique Dual Drive design allows the bit to be driven by a Ratchet Socket Spinner Box or Open End Wrench Compatible with 1/4” Square Drives and 7/16” Hex Drives Warranty: Lifetime, does not cover abuse or neglect.  Made from S2 Tool Steel with proprietary heat treat for superior strength and durability, Mayhew's dual drive bits have a precision tip profile for positive and precise fastener engagement. A titanium nitride coating provides added strength and wear resistance. Available in a range of sizes and styles.