Dualdrive screw Pro-Bolt Pro-Bolt DualDrive designed for race teams The ultimate screw combines form and functionality in perfection. Benefit from the outstanding functionality, stability and durability! You can select the required tool (hexagon socket or nut), depending on accessibility and torque. The dual-drive functions: Head design that is compatible with both nut socket and hexagon socket. Forged screws with rolled thread for superior strength. Aircraft titanium 6AL4V (grade 5) for strength and durability with fantastic weight saving. Race Spec pre-drilled for wire lock. The flexibility of design makes these screws the first choice of Moto GP, WSBK & BSB racing teams worldwide. Extreme weight savings, as 42% lighter than steel