Studdles Angle Track for Storm Panels 90 Degree, 20 feet Protecting your home or business from storm and hurricane damage is extremely important, so we want to make sure your investment is well protected. This product could be used for storm panels that are 6' or 12' On Center, the "Track Bolts" will slide into any position on the track. This angle it used for floor or wall as well.To figure how many Track Bolts and Washer'd Wingnuts you'll need, the Formula is simple.Track Foot Length x 2 2 Example; 87" Track = 7.2' x 2 = 14.4 2 is 16.4 so 17 Bolts and Nuts should cover it.