Gaffer Grip Heavy Clamp with 5/8 Stud- Spring Clamp with Rubber Jaw And 5/8 In Mount Stud Supports up to 10 pounds weight 2 attachment options: 5/8 inch stud mount and 5/8 inch socket mount with locking screw Attaches to any flat or pole up to 1.5 inches thick Extra strong spring action 8 rubber jaw bumpers assure non-slip grip