For the flat washer Inside Diameter: 5.4mm ; Outside Diamter: 10mm; Thickness: 1mm
For the lock washer Inside Diameter: 5.1-5.4mm; Compressed Thickness: 1.2-1.4mm
Material: 304 stainless steel (A2) and no exterior finish, greater strength and corrision resistance performance than regular stianless steel or zinc plated fasteners.
Flat washers are commonly used with bolts, screws and nuts to prevent from pulling through the surface.
Lock washer, also called spring washer, split lock washer are used to keep threaded fasteners from loosening.