Maxx-ER (D/C) Brass Square Pocket Electrode Holder S20Fully compatible with Erowa ITS Systems, the Maxx ER Brass Square Pocket Electrode Holder S20 meets all necessary requirements. Maxx ER Brass Square Pocket Electrode Holders includes 2 stainless setscrews for each unit, come with sealing lip installed and external gripper slots for robotic operations. All Maxx ER holders are post assembly ground to ensure the industries best flatness tolerances. Feet are torqued and ground to maximise performance.