Countersunk Washer, Material Grade/Class 18-8, Material Stainless Steel, Finish Plain, For Screw Size M4, Outside Diameter 16 mm, Countersink Angle 90 Degrees , Overall Height 3 mm, System of Measurement Metric, Dimensional Standards RoHS Compliant, Made in North America Made in North America, Material Quality Standards ASTM A582, Minimum Inside Diameter 4.3 mm, Pack Size Small Pack, Resistance Properties Corrosion-Resistant, Tensile Strength 90,000 psi, Thickness Tolerance +/-0.01 in