This Lucasi and Players Weight Bolt will fit in Lucasi, Players, Dufferin and Rage Cues. It adds a 0.5oz weight to your cue and measures 2 1/4" Length x 1/2" Diameter. Customize the feel of your cue by adding or subtracting weight bolts from the butt. 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 Wrench 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 losing a game.