This RIDGID 36620 141 Receding Geared Threader is a top-quality tool for your pipe threading needs. It is designed to thread pipes with a diameter range of 2 1/2-4 inches and a right-hand thread direction. The tool is made by RIDGID, a trusted brand in the industry, and has a NPT thread standard. With its durable construction and efficient performance, this pipe threading machine is perfect for both industrial and personal use. It is easy to operate and ensures accurate threading every time. This unit quantity includes one threader and is a must-have for any professional or DIY enthusiast.