The RIDGID 817 (84532) Universal Semi-Automatic Die Head, RH, 1" to 2" NPT, is designed for use with 1215, 1233, 300 Compact, 535, 535A Machines and the 300 Power Drive. The semi-automatic die head can be quickly adjusted from size to size and is manually opened for user specified thread length. The die head operates with a system of four position blocks on the cam plate. Each block can be adjusted and set independently, allowing the operator to change sizes quickly and accurately. The 817 Die Head is for the 1" to 2" size range and uses RIDGID Universal dies.