【Size】: The black dome bolt nut has a total of 145, including 50Pcs for M4, 30Pcs for M5, 20Pcs for M6, 20Pcs for M10, 15Pcs for M12, and 10Pcs for M8. Please carefully confirm whether the size is what you need before purchase. 【Reasonable design】: The bolt covers screw cap is a round head design, which can prevent accidental damage caused by the nut and screw protrusion. Protect your family and children from being scratched by the screws. 【Multi-function】: The nut cover can prevent screws and nuts from rusting; Reduce dust pollution and extend the service life of screws and nuts; Prevent scratches and injuries. 【Material】: The dome bolt covers and plastic storage box are made of high quality plastic. It has no pollution, has good low-temperature resistance, and will not be easily deformed and broken after long-term use. 【Easy to store】: The plastic hex nut cover is placed in the plastic storage box according to the size, you can easily find the size you need. It can also be placed