Ample quantity: you will receive 100 pieces M4 x 10 mm threaded knurled thumbscrews, which can be installed in any place you need, and meet your daily use and replacement Quality material: the male thread knurled clamping knobs are made of quality carbon steel, with good hardness, strength, corrosion resistance and wear resistance; It is a fastening accessory that can be applied for a long time and could be reusable for most different purposes Nice craftsmanship: the surface of the grip thumb screw on type round head is smooth, the thread is neat and uniform, without burrs, making the installation effect more tight Easy to Use: These handle knob thumbscrews are screw-on design, which is simple and easy for you to install. They have smooth and clean surface, thus making them more convenient to use. Warm notice: it is recommended that you need washers as gaskets when installing some monitors to prevent affect to the computer monitor; The length of the screw part is 10 mm, which may bottom out on some computer monitors; You just need a layer of buffer to prevent direct contact in some cases