First, the store is shipped solid stores, there are a large number of stock spot, the screw has different precision, surface treatment, so please contact with the boss before the call or call13018664101
Two, the price of different precision is the same, please rest assured to buy, on the accuracy of the purchase will be described in detail, or before the contact with the shopkeeper, which kind of accuracy is needed
Three,The difference between the spiral wire tapping and the ordinary hand wire tapping is that the groove of the ordinary hand wire attack is linear, while the spiral wire attack is spiral. When the screw thread is used to attack the tooth, the iron filings can be easily discharged from the hole by the spiral rotation of the spiral groove, so as to avoid the residual iron or the blockage in the groove, and cause the broken edge of the wire tapping and breaking, so that the life of the wire tapping can be increased and the thread with the highest precision can be cut out. Spiral wire tapping is suitable for cutting high toughness materials, but not suitable for fine chips such as cast iron.
Four, the first express: Xinfeng (Guangdong province), pass (Guangdong province), from the select SF express, any other specified express please inform the seller, thank you!