This is a motor mount for motors with 16mm hole spacing. It is made for dollar tree foam but the gap is 5mm so other surfaces can work as well. The holes are M2 but later I will release a M3 version. I use this with my 1806 brushless motors. The primary method of bonding is glue, but there is a hole for a wooden bbq skewer for extra support. I would also recommend strengthening the area around the motor mount. This will help stop the foam from creasing in the area directly around the motor mount.