Name: Flat Head Built-in Expansion screwsMaterial: 304 stainless steelSpecification: M6 - M10Specification explain:For example: M6 * 40, suggests that the thread diameter is 6 mm and the complete size of screw is forty mm.1.Wholesalers and retailers are welcomed.For wholesale,we will provide reduction or loose specific delivery which only takes couple of minutes to arrive.If you are a store and wish make your own business, lets ship the products on your customersdirectly and won't depart information about us if you'd like to.2.What must I do if I don't obtain my item?Please touch us first, we will music your item.If you can't obtain it, we can full refund or resend it for you. We are honest seller, so don't worry.3. If the products have issues how to do it?Please touch with us in time, we can assist you remedy it.