Warrensville File & Knife, Inc. Thread File Internal & External

For nut & bolt, extra fine & coarse
threads per inch: 9, 10, 12, 16, 20, 27,

Restore damaged thread on bolts and EXTERNAL and INTERNAL pipe thread with only one easy to use hand tool. Use it as a thread gauge. This multipurpose tool comes in a reusable plastic tube for easy storage even in a cluttered machinist's or pipefitter's tool kit without fear of chipping the precision teeth.For nut & bolt, regular thread
threads per inch: 11, 12, 13, 14, 15, 16, 18,