Hole size should be a minimum of 1/16" larger diameter than the screw size.
Specify plate size: width & length.
Plate will be welded in center of height dimension unless otherwise specified.
Hotdip Galvanized After Fabrication
You should consider the overall length of the anchor and the height of the plate to make sure there is enough room for the installer to get the screw and tool in place without interference from the welded plate.
Specify the length as measured from the outside dimension of the bend and plate.