Fit Screw Diameter: 4mm/ 0.16". Screw Cap Inner Diameter: 18mm/ 0.71". Screw Cap Outer Diameter: 22mm/ 0.87". Feature : Direct fit, no mod required, can be fitted in a minute. Multiple applications: Auto, car, home, furniture decor and so on Please allow 1-3mm error due to manual measurement. pls make sure you do not mind before you buy. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you! 20 Set x Car Screw Cover Cap