This is a complete seat binder assembly for a BMC Pro Machine SLC 01. It is compatible only with the Pro Machine, and no other frame model. BMC recommends that you torque the upper bolt to 5Nm (35-40 in/lbs), and the lower bolt to 7-8Nm (62-70 in/lbs). More specifically, BMC suggests that you first torque the lower bolt to 8Nm, followed by the upper bolt to 5Nm. Once you bring the upper bolt to 5Nm, re-tension the lower bolt up to 8Nm to regain the torque lost due to equalizing the pressure distribution on the clamp.
The actual weight of the BMC SLC01 Seat Binder Assembly is 17g.