For securing climbing routes - the Coeur Stainless bolt by Petzl comprises a hanger, an expansion dowel and a suitable nut. Made of stainless steel, the bolt is suited for rock climbing. Little nubs on the back keep the hanger from turning during the climb. Note: The assessment of stone quality and the placement of bolts requires a lot of experience and expertise. For this reason, only trained users and professionals should secure climbing routes!