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, there is a detailed description about the accuracy of the purchase below, or before making contact and dispensers which need precision
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. Spiral screw in tapping, to increase its rotation of the spiral groove, can easily cut iron from the hole, so as to avoid iron residue or blockage in the trench, caused by tapping broken edge crack, so it can increase the life of wire tapping and cutting out the thread of high precision. 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!