Steel Strikers Nickel Coated w/ a Countersunk Hole for #10 Flat Head Screw
This round striker is a heavy duty steel wafer with 34 mm in diameter and 3mm in thickness. It is also Dia 1.34" x 0.12" Thick in inches. There is a #10 Countersunk Hole in the middle for flat head screw. It works very well with any disc magnets from 3/4" to 1.26" in diameter and provides most of the holding power of the magnets.
The list of the magnets which match up with this strikers,