1/4-20 Hexagon Bolt Kit: BNUOK 1/4-20 x 3-1/2 Inch black bolts with hex nuts,Flat & Lock Washers Head Diameter,with bright finish,clean & smooth thread and no burrs,This 1/4 x 20 Hexagon black bolts makes your project look more professional which are favoured for heavy-duty fastening applications. 304 Stainless Steel:This hex nuts and bolts, washers are 100% made of high quality 304 stainless steel,black zinc plated, which has superior anti-rust and abrasion resistance.Bolts hex head is not easy to strip,better torque transmission but also more stable performance Details:Thread Diameter: 1/4"; Thread Pitch: 1/20"; Screw Length: 3". Head Diameter: 0.437",Meet ASME B 18.2.1 specifications. Widely Use:This stainless steel 1/4 hex bolt sets are fit for precision mechanical and industrial applications,household appliances,engines,automotive part,motorcycle accessories repairs and small repairs such as door handles,lamps,locks. Quantity & Size: You will get 48 Sets 1/4-20 x 3 Inch bolts,SAE bolt nut kit provide 1:1:1 matching combination,each Bolts matching a hex nut ,Flat & Lock washers,Please connect us,if any problem. BNUOK 1/4-20 x 3" Hex Head Screws Bolts,Hex Nuts,Flat & Lock Washers,304 Stainless Steel 18-8,Black Zinc Plated,Fully Threaded(48 Sets)