Size: 1-1/2" Width X 3-1/2" LengthThickness: 1/8"Material: PlasticColor: RedMaximum Bolt Width: 9/16"Lightweight Horseshoe Shaped Shims Are Designed To Fit Around Bolts And Anchors And Are Often Used For Aligning Windows Or Curtain WallRounded Shape Allows For Greater Flexibility In Aligning The Shim With No Protruding CornersDoes Not Expand Or Contract Due To Weather ChangeDurable Design That Is Vermin, Insect And Decay Resistant