Grade 5 Master Hex Head Bolt Assortment Kit (175 Pieces) with Free Nut Bolt Size Gauge 475 Piece Assortment with Nut Bolt Size Gauge Included Includes bolts, hex nuts, lock nuts, flat washers & lock washers Grade 5 Zinc Plated Steel All the popular sizes are included (1/4, 5/16 & 3/8 diameters)