Unique Adjustable Flip Windshields - It is actually a two part windshield made from DOT approved 3/16” aircraft quality Lucite Acrylic. The lower portion is dark smoke with the flip upper portion clear. The upper portion can be flipped in seconds from hiding behind the lower portion to extending above the lower portion increasing the overall height. P/N 20-120 flips from 8” to 12.5”. P/N 20-128 flips from 9 1/2" to 21 1/4". Each windshield comes with two sets of hardware, use the quick release thumb screws or blind mount allen head cap bolts.