Easily adjustable with powerful magnets. No thread lock or special tools required. Superior ramp profile for better performance. Five-step metal treated process for durability. compatible with Polaris and compatible with Arctic Cat pre-04 models (ones with bushings) come with arms, magnetic inserts and an Allen wrench. compatible with Arctic Cat 04-15 non-bushing models weights come with arms, setscrews, magnetic inserts and an Allen wrench for the setscrews. compatible with Arctic Cat BOSS 16-18 weights come with three arms loaded with bushings and 48 magnets. compatible with Ski-Doo 850 E-Tec 17-18 weights come with three arms and 24 magnets. For all non-bushing compatible with Arctic Cat models 2004-2015