Small Rubber Grommet ---- Inner Diameter 3/16" ---- Outer Diameter 13/32" ---- Overall Thickness 7/32" ---- For Panel Thickness 1/16" ---- For Panel Hole Diameter 5/16" ---- Used to Insulate and seal around holes cut in solid panels ---- Also Used to dampen vibration and minimize abrasion. ---- Durometer hardness - 55A ---- For Use indoors. ---- Color is black. ---- Flexible grommets made of SBR rubber ---- Temperature range –56° to +200° F. ---