Features and Benefits:•Fits chuck model 48-66-0817•For chuck kit model 49-22-1560•Fits 2.4 Volt cordless screwdrivers (models 6539-6, 6540-1, 6546-6, 6547-1 and 6547-22)•SteelFor use with chuck kit 49-22-1560. It is used on Milwaukee 2.4 Volt cordless screwdriver models 6539-6, 6540-1, 6546-6, 6547-1 and 6547-22. it is also used with chuck 48-66-0817.