Lightweight, compact, and precision control make these speed controls the right choice for many heavy-duty applications. These speed controls are offered with in-line and elbow construction to give the widest choice to your unique application. Locking nuts are included as standard as well as simplified mounting. Thread sizes range from M3 to 2 and are available in both inch (NPT) and metric R/Rc(PT),Speed controller standard in-line style,Body sizes: M3, M5, 1/8, 1/4, 3/8, 1/2,Port sizes: M3, M5, 01, 02, 03, 04