What type of screw is used for Trex Seclusions Fence

The type of screw used for #6 1-5/8" wood exterior screw. There are four screws per bracket and four brackets per kit. Beyond these 16 screws, the same type of screw is used to attach the Trex Seclusions pickets to the posts and to attach the top rail to the Trex Seclusions brackets.