RRI K2.0001016 (K20001016) HEB-1 Handle Extension Block arri_k2.0001016 / K2.0001016. Arri Handle Extension Block HEB-1. Attaches to the Center Camera Handle (CCH-1) or any 3/8″-16 UNC threaded mounting point. When attached to the front of the Center Camera Handle (CCH-1), the tape hook is excatly in the sensor plane. Includes 3x 3/8″-16 UNC threaded mounting points.