Take on a wide range of professional jobs with this 1/4 in. and 3/8 in. Drive Mechanics Tool Set (142 PC.). Featuring a 1/4 in. and 3/8 in. ratchet with a 20% thinner head*, this 142 piece set is ideal for applications in tight spaces. Ergonomically designed handles and anti-slip grooves help provide comfort and control during all-day jobs. A quick-release lever allows one-handed use and a chrome vanadium steel construction provides durability on tough jobsites.