This Joss and Viking Weight Bolt Set will fit inside the stackable weight bolt system of a Joss or Viking Cue. It includes 2 bolts for each 1, 1.5 and 2 ounce weight. Customize your cue to the weight of your preference by adding or subtracting these bolts. They are easy to install just pop off the butt cap from the butt end of your cue and with the use of a 6mm Hex Key or Allen Ranch Tool (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 loosing a game.