Material: ZINC PLATED STEEL Assembled Product Length: 1.5" Grade: #5 Assembled Product Height: 0.5" Assembled Product Width: 0.5" Fastener Diameter (Imperial): 0.5" Fastener Length (Imperial): 1.5" Fastener Length (Metric): 38.1 MM Fastener Diameter (Metric): 12.7 MM . UNF grade 5 • Made from medium carbon steel, quenched and tempered for higher strength • Three radial bar head marking