1.high performance product 2.different surface finish is available. 3. professional manufacturer Fasteners & WrenchesMaterial by steel or stainless steelDimension according to standard or customer's designMetric and SAE size is availableStandard: DIN471, DIN472, DIN6799, DIN5417, DIN7973...Different surface finish is availableSize from 5mm-150mmCustomer's design welcome!