Solar Fastener Expert 361031SS 18-8 Stainless Steel Split Lock Washer， 5/16-Inch<div style="text-align: left;"><strong>[Product Information]</strong><br><ul><li>300 Series Stainless Steel， (18-8)</li><li>Tensile - 100，000 psi to 125，000 psi</li><li>Hardness - 85 Rockwell B</li></ul></div><img src="http://ecx.images-amazon.com/images/I/411Q5mhiIUL.jpg" noproxy>