The John Deere 23pc. 1/2? Socket Set is made from a strong chrome vanadium alloy steel and includes the following. 17 x 1/2? Standard Hex Sockets (MCKTC141M) – 8mm, 10mm, 11mm, 12mm, 13mm, 14mm, 15mm, 16mm, 17mm, 18mm, 19mm, 21mm, 22mm, 24mm, 27mm, 30mm, 32mm. 3 x 1/2? Extension Bars (MCKTC542) – 75mm, 150mm, 250mm. 1 x Universal joint (MCKTC5471). 1 x Sliding T-Handle (MCKTC545212). 1 x Push Button Ratchet (MCKTC4471AG). For more than 180 years, John Deere has led the way in developing innovative solutions to help their customers become more efficient and productive. They conduct business essential to life. Running for the people who trust them and the planet that sustains us.