Lock Washer Lock Washer Type Wedge Lock Finish Plain Material Stainless Steel For Screw Size 3/8 in Inside Diameter 0.409 in Outside Diameter 0.705 in Maximum Thickness 0.135 in Assembly Thickness 0.135 in Color Silver Material Grade/Class Not Graded Pack Size Small Pack Resistance Properties Shock Resistant Vibration Resistant Rockwell Hardness HRC25 System of Measurement Inch Package Quantity 200