The 1-1/8” washers for 1” magnets are countersunk for use with flat head screws and are packaged with six #10 x 5/8” screws.
The 7/8” washers for 3/4” magnets are countersunk for use with flat head screws and are packaged with six #10 x 5/8” screws.
The 3/8” washers for 1/4" magnets are countersunk for use with flat head screws and are packaged with ten #4 x 1/2” screws.
These cups are all countersunk for use with flat head screws and are counter-bored to fit the rare-earth magnets we sell.