manufacturer of professional power tools on the market. The 199154-9 is a ½” 20UNF keyless chuck, equipped with a 13mm diameter. 199154-9 is suitable for use with Makita DDF and DHP 484, 456, 480, 459, 452, 450 and 442 Combi Drills and Drill Drivers. The 199154-9 is constructed from high quality materials for increased durability and a longer service life and quick and easy to install for user convenience.