0.015" Thick 1/4 hard temper
Mild steel rusts. Scale will vary in appearance depending on the stage of this process. You may get light grey scales, or dark oily grey, or rusty, or partially rusty. All of this is normal and expected with mild steel.
Size: 9/16" x 7/8", 0.22" hole (14.3mm x 22.2mm, 5.6mm hole).
Ring size for standard overlapping scalemail pattern: 18g SWG 3/16" ID
Scales per square foot: approximately 1000
You will need 2 rings per scale; more if you are stablizing the edges.