Mr Gasket Header Bolts - 3/8-16 x 1 Inch Hex Head - Black Oxide - 100 Pieces - 917ABulk Header Bolts 100 Pieces Bolt Size 3 8 16 X 1 Inch Part Number: 917A Designed for make header installation easier and heat treated for extra strength. The special washer faced, smaller than standard hex head is for tight spaces. These bolts are Grade 5 with a 7 16 hex head and a protective black finish, except where noted. Bulk Packaged 100 pieces. 3 8 inch 16 x 1 inch. Features and Benefits 100 Pieces Bulk Package