The Petzl BOLT HCR 12 mm Anchors are high-quality stainless steel bolts designed for use in corrosive environments, such as coastal areas. This pack includes 20 bolts, each featuring a 12 mm diameter and a drilling depth of 8.5 cm. Constructed from 904 HCR (High Corrosion Resistance) stainless steel, these bolts offer exceptional durability and resistance to corrosion. Each bolt weighs 85 grams and comes with a 3-year warranty.