TEKTON hand drive adapters and reducers allow you to expand your range. An adapter or reducer can help compensate for lost or broken sockets, fill in gaps for incomplete size ranges, and expand the range of your socket system. This set includes 1/4, 3/8, 1/2, and 3/4 in. drive adapters and 3/8, 1/2, and 3/4 in. drive reducers. Detent grooves and beveled edges on each tool provide a smooth and secure connection with the drive tool. The 3/4 in. drive (F) x 1 in. drive (M) adapter and the 3/4 in. drive (F) x 1/2 in. drive (M) reducer have a drilled through-hole that allows the ability to lock onto a drive tang with a retaining pin. This set includes rail organization.