... steel 3.free sample 4.over 10 years maker black wood screwsFeatures:Material:stainless steel,carbon steelSurface:nickel plated,zinc ... screw slot form:philips,phil-slot,pozi,hexsocket,six-lobe,square,triangle,slotted. Place of OriginGuangdong,China(mainland)Brand NameJinri ... tapping screws,Jinri's major product line includes chipboard screw, wood screw,drywall screw, machine screw, TEK screw, and deck ...