[Knurled Head Thumb Screw]: The package comes with 10pcs of silver tone knurled head thumb screw in 15mm/0.59" Total Length, 7mm/0.28" Phillips Size, 0.5mm Thread Pitch, Head Size in 8 x 7mm/0.3" x 0.28"(D*L), Thread Size in M3 x 8mm/0.12" x 0.3"(D*L) [Sturdy & Durable]: Made of metal, wear-resistant, and anti-corrosion, the thread is neat and uniform, without burrs. [Features]: The knurled surface on these Phillips thumb screws provides optimal gripping allowing the screw to be tightened and loosened by hand pressure, then secure snugly with a screwdriver. [Good Choice]: The knurled knobs are widely applied in PC computer cases, computer PC graphics cards, hard drives, machinery equipment, communication equipment, electronic equipment, the automotive industry, instruments, lighting products, and so on. [Notice]: It is recommended that you need washers as gaskets when installing some monitors to prevent an effect on the computer monitor; The length of the screw part is 8mm, just need a layer of buffer to prevent direct contact in some cases.