It can be used directly embedded into clocks, hardware clocks, iron clocks, lighting-clocks, etc. Come with back cover and rubber gaskets to secure the insert in place, which can prevent slight irregularity in the hole. Great for DIY crafts replacing old clock face, and the clear cover reads the-time easily. Quartz clock insert features a golden/silver colored trim, and black arab numerals for easy-reading. Suitable for all kinds of crystal, ceramics, marble and other crafts table clock