Tap & Drill Set, National Course Thread, #4 X 40

#4 x 40, national course thread, tap & drill set, carbon steel, ideal for routine maintenance, repair work & for rethreading where high accuracy & tolerance thread is not critical, straight flutes are ground to provide rapid chip removal for efficient threading, designed for hand threading work in a variety of materials taps produce a class 2b thread, includes #43 drill bit.

• Drill and tap set
• Tap is designed for hand cutting applications
• Wire gauge drill bits are made from premium grade high speed steel
• Wire gauge dill bits are for general purpose drilling in wood metal and plastic