Professional tool for commercial or occasional use. Suitable for creating and repairing popular UNF / UNC / Imperial size threads. SET Includes: 17 tap and die pairs, 1 x tap wrench (suitable for taps M3-M12), 1 x die holder (internal diameter 25mm / 1"), 16 x UNF / UNC pairs and 1 x NPT set, 1 x flat head screwdriver, 1 x feeler gauge. COARSE SIZES INCLUDE: 4NC40 / 6NC32 / 8NC32 / 10NC24 / 12NC24 / 1/4NC20 / 5/16NC18 / 3/8NC16 / 7/16NC14 / 1/2NC13. FINE SIZES INCLUDE: 10NF32 / 1/4NF28 / 5/16NF24 / 3/8NF24 / 7/16NF20 / 1/2NF20. NPT SIZE INCLUDES: 1/8NPT27. Comes in a metal tin for easy storage and transportation. Also suitable for creating stronger internal threads in soft materials.