... , double thread, high and low thread, with various head types and drive types. Used in wooden article Product NameChipboard ... 80mmMaterialCarbon steel or stainless steelHeadFlat, countersunk,double countersunk (Pan head is also available)Drive/RecessPozi, Torx, Philips, or otherThreadCoarse, fine, ... on alibaba or our official site at www.quanling-screw.com.) 2, What information should be included ...