The main models are: 1-1 / 4 "-4BPV, 1-1 / 2" -4BPV, 1-3 / 4 "-4BPV, 2" -4BPV, 2-1 / 2 "-4BPV, 3" -4BPV, 3-1 / 2 "-4BPV, 4" -4BPV, 4-3 / 32 "-4BPV, 4-1 / 4" -4BPV, 4-3 / 8 "-4BPV, 5" -4BPV, 6-1 / 16 "-2BPV, 6-1 / 8" -2BPV, 6-5 / 16 "-2BPV, 6-3 / 8" -2BPV 4 teeth per inch and two teeth, L Kaijie Si equipment Ltd. Suzhou, China the biggest sellers thread gauge, the lowest price, the most widely used models, specifications of the most homogeneous, the largest brand, the best quality! Welcome to inquire