Hex-head/wing design. Shaft and shoulder design same as PROFORM P/N's 66004/66005. 4 High, with additional 1 long screw in studs for optimal gasket placement. 4 per package. Product Features:Deluxe 2-Piece Style Wing NutChrome FinishMade from High-Quality SteelWing Nut is 4-1/8 Long1-1/2 Length Mounting Studs, 5/16-18 Thread.