SP Air Corporation 1/2-inch composite air drill with a durable, and light weight composite body which can handle any job you require. The model features a double-gear mechanism with a free speed of 400 RPM. The weight is 2.9 pounds and 7-5/64-inch in length. The unit has a has a chuck size of 1/2-inch (13mm) and a 1/4-inch air inlet. With SP air SAS (side and side) forward/reverse system, You can easily switch directions with one hand.