Large Rubber Grommet For 1/4" Panel Thickness/Groove Diameter --- Inner Diameter 1 1/2" --- Outer Diameter 2 1/8" --- Overall Thickness 5/8" --- For Panel Hole Diameter 1 3/4" --- --- Used to Insulate and seal around holes cut in solid panels ---- Also Used to dampen vibration and minimize abrasion. ---- Durometer hardness 60A. ---- For Indoor Use Only ---- Color is black. ---- Flexible grommets made of SBR Rubberr ----- Temperature range 0° to +180° F. -- package of 3