RIDGID 37390 Model 12-R Hand Threader Die Head, Alloy Right-Handed NPT Die Head for Nominal Pipe Size of 1/2-Inches Complete Die Head and 1/2-inch die set at factory for manual pipe threading Alloy, right-handed threaded die RIDGID Model 12-R Die Head fits appropriate ratchet and handles for pipe threading NPT (National Pipe Tapered) thread Fits ratchet assembly and handle designed for 12-R die such as RIDGID 30118