CONNETING CSCREW: Material:carbon steel ,stainless steel or brass Drive:+,+-,-,slotted,hexagon,square Finish: plain We are Jiashan Jindong fastener Co., Ltd & Jiashan Jinlong international trading Co., Ltd. We supply many kinds of Bolt, Nuts, Screws, Washers, Rivets and Hardware, If you are interested, please contact me for more detail.