Manufactured from drop-forged Chrome Vanadium steel. Hardened and tempered with a fully polished mirror finish. Stubby, compact configuration and 45° offset WallDrive® rings give improved access in confined spaces. Combines the most common fastener sizes (10 x 13mm). Essential for rowers as a rigger jigger, undoes every nut in a European boat - 10mm for riggers and 13mm for top nuts.