Made Iron platingThe carbon steel material features strength,wear and corrosion in bad environment like high temperature,cold weather,and high humidity areasDurable and nickel plated surface guarantees protection against environmental damage and rustSuperior rust and oxidation ensures their durability. EASY TO INSTALL:cage nuts and screws accord with standardized metric systemAnd the average error is less than 01mmThe screw thread is quite sharp,clean and accurate without burrThe accurate size makes your installment or repair easierThey fit your cages well, Package includes:meet your different needsIt is a good choice for both and amateurThese multifunctional bolts and nuts are your must-have tools. Widely Applications:Cage nuts and screws are universally compatible with all square-holed racksnuts and screws are great for mounting your rack server cabinets,server shelves,A/V device enclosures and more. High quality cabinet cage nuts and screws Size:M6 x 20 Fit all square hole racks server rack or cabinet Color:silver material:metal Package Contents: 50* M6 cage nut 50* M6*20mm screw Only the above package content, other products are not included. Note: Light 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.