Ridgid 35840 Pipe Tap This item is 35840 TAP, 1" NPT E5117 This product is used for pipe-taps This product manufacture by United States Drill size: 1-9/64-Inch Nominal pipe size: 1-Inch Threads per inch: 11-1/2 Weight: less than 1/2 a pound Ridgid covers its products with a lifetime warranty against defects in material or workmanship for the life of the tool.