Foliv 318Pcs Grade 8 Heavy Duty Nuts And Bolts Assortment Kit, GRADE 8 ALLOY STEEL MATERIAL: Corrosion resistance, good wear resistance, high hardness. PRACTIAL SAE SIZES: 1/4-20 x 1/2" to 1-1/2", 5/16-18 x 3/4" to 2", 3/8-16 x 3/4" to 2". Package includes 117pcs SAE hex bolts, 80PCS hex nut and 80PCS spring washers. Total is 318PCS. PROFESSIONAL LABELED PACKAGE: All the nuts and bolts and organized in a sturdy transparent box and all the sizes will not mix up. Clear labels on cover is convenient for users to get the sizes they need. WIDE APPLICATIONS: The bolts kit are widely used in machinery, furniture, car and motorcycle repair and DIY design. GREEN PROTECTION: FOLIV is donating from this purchase to White Memorial Conservation Center Inc., which is providing year-round environmental education programs for children and adults to protect natural resources (i.e. vegetation, water, soil, and air). Hope we could do something for this beautiful green world.