Product Name: Hex slotted nuts DIN935 / Hex Castle Nuts Standard: DIN935, ASME B 18.2.2 Size: M6-M30 Class/Grade: 5, 6, 10, 12; SAE J995 Gr. 2,5, 8; ASTM A194, ASTM A563 Gr. C, D, DH. Material: Stailess Steel, A2, A4, Alloy Steel, carbon steel, Cooper and so on. Surface treatment: plain, black oxygenation, zinc plated, hot dip galvanizing, etc. By the way, our biggest strength is Non-standard Fasteners according to your drawings or samples. Our ragular nuts are as following: Hex Nuts, Heavy Hex Nuts, Square/Round Nuts, Hex Jam Nuts/Hex Thin Nut. Any new enquiry is welcome here, and we'll quote you as soon as possible. Please contact us by following way: Email: fiona.fan(at)jm-industry.com MSN: jhmgm(at)live.cn Skype: jm000033