RIDGID 97065 Threading Machine Universal Die Head, Model 811A Quick-Open Right-Handed NPT Die Head with Pipe Capacity of 1/8-Inches to 2-Inches Uses Universal Dies and has a pipe capacity of 1/8-inch to 2-inch (3-50 mm) and bolt capacity of 1/4-inch to 2-inch (6-50 mm) Quick Opening die head, manual release for user-specified thread lengths Model 811A Die Head works with pipe threading machines 1215, 1233, 535, 535A, 300 Compact Machines and 300 Power Drive Right-Hand, NPT (National (American) Pipe Tapered) thread Oil through die head to protect the life of the die while threading pipe