Maze H55S530 Hand Drive Nail Concrete Nails 4D 1-1/2 in L Carbon Steel Tempered Hardened Flat Head Fluted Shank - Pack of 6

Round wire type. Made of high carbon steel, heat-treated and tempered. Designed for fastening furring strip, cleats, flood plates, partition walls and more. directly to masonry. 9 ga, 5/16 in head. Made in the USA.