For long thread screws, reduces screwing and unscrewing times by one third. Fast chuck for screwing bits series 1: 1/4" (6.35 mm). Ratchet with 3 positions: screwing, unscrewing, locking. Bush locking the helical shaft in the retracted position. Length: open, 305 mm closed, 230 mm. Finish: polished chromed. Weight: 345 g.