This McDermott Cue Weight Bolt will fit inside the weight bolt system of a McDermott, Star or Lucky Cue. It is made out of metal with a 3/4" thread size and adds a 5 1/2 ounce weight to your cue. Customize the feel of your cue by adding or subtracting weight bolts from the butt. Easy to install - just pop off the cap from the butt end of your cue and with the use of the hex wrench (not included), unscrew the old bolt out and then screw the new one in. Adjusting the weight on your cue could be the factor of winning or losing a game.