The URSA Turret 4.6K PL Mount from Blackmagic Design is an upgradeable Sensor and Mount for URSA PL Mount Existing Blackmagic Design. By replacing the existence sensor to this 4.6K sensor, you can have a better performance in every shoot. The whole capability that you can get from this device such as lens mount, lens control connections, and sensor. You can attach this device using the four bolts.