Spring the arms open and snap the belt in place around the hips. Made of high grade plastic with excellent memory. Closed cell comfort pad makes a comfortable belt that will not slip. Pin in the rotating ball can be used in either the vertical or horizontal position. Fits gimbaled rod butts 10 1 1/4" in diameter and non gimbaled rods 10 1 1/2" in diameter. Excellent for use with a shoulder harness. Gimbal rotates 90 degrees vertically and horizontally. Recommended line class up to 80 pounds.