The Quad Classic is a versatile, multifunctional insert that combines a loftier 1/4" forward pitch on one side and our popular Perfect Oval insert on the other. Like all of our Quad inserts, the Quad Classic is designed to help pro shops reduce shelf inventory and improve order convenience by combining multiple styles into one product. 19/32 through 13/16 have outside diameter of 31/32". 53/61 through 29/32 have outside diameter of 1-1/32".