Large Rubber Grommet Inner Diameter 1 1/2" Outer Diameter 2 3/8" Overall Thickness 3/8" For Panel Thickness 3/32" For Panel Hole Diameter 2" Used to Insulate and seal around holes cut in solid panels Also Used to dampen vibration and minimize abrasion. Durometer hardness - 55A. Can be used indoors or outdoors. Color black. Flexible grommets made of SBR rubber Temperature range –30° to +170° F.