Astro Pneumatic's One-Hand Switch ratchet offers a one-hand forward/reverse drive mechanism through a ring built into the handle to quickly switch between tightening and loosening. Arc swing is minimal with 60-tooth gear system; ergonomic handle offers improved control and grip. The ratchet is made of chrome-vanadium alloy steel. Comes in three sizes: 1/2" drive (No. 9722), 1/4" drive (No. 9724) and 3/8" drive (No. 9728).