1.Made of high quality 12.9 grade alloy steel, They have superior rust resistance and the of oxidation resistance, which can long time using.2.M2 Hex Socket Head Cap Screws Nuts . According with standardized metric system. And the average error is less than 0.01mm. The side anti- grooves on the head of this screw allow you to manually screw it in. Even if the hexagon socket , you can use the side anti-skid groove of the head to continue screwing the screw in or out.3.All of Screws and Nuts are packed in a durable and sturdy Transparent Box( 7.48x5.12x0.83in), Keep your screws organised, Easy to take and use.4.M2 Hex Socket Head Screws and Nuts Assortment Kit wide range of uses and for , amateurs, landlords, repairmen, other DIY . The set is perfect to replace broken and missing screws. The kit has lots of different sizes, which can meet the maximum of requirement .Tool Supplies:Assembly CategoryRC Parts & Accs:Servo AccessoriesUse:Vehicles & Remote Control ToysTechnical parameters:Value 2Remote Control Peripherals/Devices:ReceiversFor Vehicle Type:Four-wheel Drive :AssemblageWheelbase:ScrewsColour:BlackMaterial:steelSize: 7.48x5.12x0.83inPackage Contents:1 * RC Car Screw Set (1124pcs)Only the above package content, other products are not included.Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.