Prime Line 9090608 Serrated Flange Bolt

Diameter-Thread Size & Length: 1/4 inch-20 X 1/2 inch Hex bolt with a serrated circular flange under the head Flange eliminates need for separate washer Serrations bite into surface and can help to prevent loosening Designed for use with a nut (not included) or a threaded hole of the same diameter and thread size, Weight: 0.01 Pounds, Manufacturer: Prime-Line