Zinc-plated hardened steel. Round shank. For fixing wood to brick, breeze block and most types of masonry. Includes assorted sizes 20 to 40mm. Handy storage case with compartments. Zinc-plated hardened steel. Round shank. For fixing wood to brick, breeze block and most types of masonry. Includes assorted sizes 20 to 40mm. Handy storage case with compartments.