Name High Strength Carbon Steel DIN 12.9 UNC Cup Hexagon Socket Head Screws Bolts Black Specification According to customers' requirements Material Stainless steel 303/304/316, Carbon Steel, Brass, Bronze, Aluminum, Titanium, Alloy Standard ISO,GB,JIS,BS,ANSI,DIN Category Connector, nut, etc Dlivery 15-30� day