This magnet has a very strong pull and the screw hole makes it easy to mount. Be aware this is for one magnet. I have uploaded a photo of it next to a US quarter for size. Mine is almost 20mm, closer to 19mm and a little short of 10mm high again closer to 9.5mm. Not a deal breaker for me ordering more.

This magnet has a very strong pull and the screw hole makes it easy to mount. Be aware this is for one magnet. I have uploaded a photo of it next to a US quarter for size. Mine is almost 20mm, closer to 19mm and a little short of 10mm high again closer to 9.5mm. Not a deal breaker for me ordering more.

This magnet has a very strong pull and the screw hole makes it easy to mount. Be aware this is for one magnet. I have uploaded a photo of it next to a US quarter for size. Mine is almost 20mm, closer to 19mm and a little short of 10mm high again closer to 9.5mm. Not a deal breaker for me ordering more.

The item is 19,5 mm diameter, 9,75 mm hight. Hole diameter is 6mm. The magnet is really very strong!

The item is 19,5 mm diameter, 9,75 mm hight. Hole diameter is 6mm. The magnet is really very strong!

The item is 19,5 mm diameter, 9,75 mm hight. Hole diameter is 6mm. The magnet is really very strong!