Do it 7-Piece Impact Driver Set is designed to handle tough fastening tasks with ease. Featuring a durable black oxide finish, this set includes four 5/16" steel alloy insert bits—two Phillips No. 2 and 3, and two standard slotted bits sized 5/16" and 3/8". It also comes with a socket adapter, a chrome-plated knurled driver for a comfortable grip, and a sturdy metal case for convenient storage. This impact driver set is for loosening or tightening rusted or frozen screws, nuts, or bolts by delivering powerful blows from a hammer, making it an essential addition to any toolbox. Model Number: 302139