The Predator Uni-Loc ® Weight Cartridge Kit lets you fine-tune the weight of your pool cue within a tenth of a ounce. Eight different weights, ranging from 0.1 oz. to 2 oz., give you up to 30 possible weight combination for unmatched precision. The versatile installation tool has dual prongs that interlock with each weight and a detachable handle. The tool can be used with the handle for easy on-the-go tuning, or with a drill bit for lightning fast tuning at home. Weight Cartridge Kit will work on the following cues 8K Series, BK III Series, BLAK2 Series, CRM Series, IKON2 Series, P3 Series, SP6 Series, SPORT II Series, THRONE Series, LIMITED & SPECIAL ED. (2012 & NEWER), and MOLINARI BY PREDATOR Carom Cues.