This Listing Is For: (1) One McDermott 1/2″ 3.5 oz. Weight Bolt. This McDermott Cue Weight Bolt will fit inside the weight bolt system of All Current McDermott Models And Most Models From The Past Five Years, G-Series, Star, Lucky, KIT, TC, Some M-Series Cues, Some E-Series And Some Other McDermott Cues With A “Push In Rubber Bumper” But NOT All. Some Models Require A 3/4″ Bolt (also available in our other listings) Check Before Ordering. The Weight Bolt is made out of metal and adds 4 oz. 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 butt bumper from the butt end of your cue and with the use of a Hex Key or Allen Wrench Tool (also available in my other listings) unscrew the old bolt out and then screw the new one in. Need a different weight bolt? .5 oz., 1.0 oz., 1.5 oz., 2.0 oz., 2.5 oz., 3.0 oz., 3.5 oz. and 4.0 oz. are also available in our other listings. Adjust the weight of your cue for the perfect feel.