Tough, heat-treated carbon steel for high torque application. Rubber-coated feet for improved grip. Corrosion-resistant electro plating. Self-tightening mechanism grips filters from 60 – 110mm. For gripping filters with flat faces only. 3/8″ square drive. Tough, heat-treated carbon steel for high torque application. Rubber-coated feet for improved grip. Corrosion-resistant electro plating. Self-tightening mechanism grips filters from 60 – 110mm. For gripping filters with flat faces only. 3/8″ square drive.