The McDermott Element adjustable Weight Bolt System gives you the ability to fine tune the feel of your pool cue in your hands! Easy to use, quickly adjustable to help you add or take away weight until you find the perfect balance to your game! PLEASE NOTE: THIS ONLY WORKS FOR MCDERMOTT ELEMENT CUES ONLY. IT WILL NOT WORK WITH MCDERMOTT USA, STAR, LUCKY, ETC.