Size:3/8" 1/4" 5/16" Color:Black Material:carbon steel Fastener Type:Cap, Hex Package Dimensions ‏ : ‎ 8.98 x 7.05 x 1.77 inches; 3.46 Pounds Product Feature: 1.Hex head cap screw bolts with nuts, flat washers and spring washers meet all demands , nuts and bolts assortment include: 1/4"-20 x 3/4", 1/4"-20 x 1-1/2", 1/4"-20 x 1", 1/4"-20 x 2", 5/16"-18 x3/4", 5/16"-18 x 1", 5/16"-18 x 1-1/2", 5/16"-18 x 2", 3/8"-16 x 2-1/2" and 3/8"-16 x 1-1/2". 2.Hex bolts screws assortment kit is made of high quality 304 stainless steel, more durable and firm] assorted nuts and bolts have superior rust resistance and the excellent of oxidation resistance, which can ensure long time using. 3.Bolts nuts and washer assortment kit with SAE system, more size,,more quantity various size of 3/8" 1/4" 5/16" screws and nuts, flat washers, spring washers total 240pcs. 4.Large nuts and bolts assortment kit can be widely used in all kinds of precision machinery, classified instruments, instruments, electronic products, household appliances, communication products, locks, lamps, lights, toys, etc. 5.Bolts and Nuts Fasteners All are Stored In One Storage Bin Box. In case of missing or confusing.