307Pcs Nuts And Bolts Assortment Kit,1/4-20, 5/16-18,3/8-16 Hex Head 304 ?Sizes?:This nuts and bolts assortment includes a total of 12 sizes: 1/4"-20 x 3/4", 1/4"-20 x 1, 1/4"-20 x 1-1/2", 1/4"-20 x 2", 5/16"-18 x 3/4", 5/16"-18 x 1", 5/16"-18 x 1-1/4", 5/16"-18 x 1-1/2", 5/ 16"-18 x 2", 3/8"-16 x 1-1/2", 3/8"-16 x 2'' and?3/8"-16 x 2-1/2" to meet your various needs ?High Quality 304 Stainless Steel?: Nuts and bolts, washers are made of top-quality 304 austenitic stainless steel. they are very slightly attracted, excellent wear-resistance, corrosion resistance,no sharp edges,no burrs, and high rust resistance?sturdy and durable,It can withstand challenging environments like high temperatures, cold weather, and high humidity areas. ?Bolts Nuts and Washer Assortment Kit?: This bolts kit is UNC size,including 1/4", 3/8", 5/16"nuts and bolts, flat washers, spring washers total 307pcs,1.8KG. All sizes are international standard,Bolts standard:ANSI/ASME B18.2.1,washers standard: ANSI/ASME B18.22.1(SAE),nuts standard:ANSI/ASME B18.2.2, spring washers standard:ANSI/ASME B18.21.1. clear threads, even force, precise grip, you can used in many professional applications,and for DIY project. ?Box with Compartments?: Bolts and nuts are stored in a sturdy transparent plastic case. The case features separate grids to distinguish the different sizes to prevents bolts from getting mixed up in shipping. There is also a crash-proof paper box outside the pp box,Avoid box damage and bolt mixing caused by transportation collision,Each grid has a specification label, making it easy for you to find the size you need. This clear and easy-to-use storage box ensures convenient organization and easy access to the bolts whenever you need them. ?Wide Range of Applications?: Hex head bolts can be widely used in various project,construction project ,Equipment manufacturing,equipment maintenance,house construction and repair,Car maintenance,machinery manufacturing and maintenance,Ship and aircraft manufacturing and maintenance,Highway bridge project,also can used in home repair,DIY project