These rubber grommets are used to protect through holes by eliminating sharp edges, safeguarding wires, and enhancing the aesthetic appeal of your application. Available in 115 sizes to fit mounting holes from 0.250 inches (6.4 mm) up to 2.375 inches (60.3 mm) in diameter, and suitable for panel thicknesses ranging from 0.063 inches (1.6 mm) to 0.188 inches (4.8 mm). Made of SBR rubber (unless otherwise specified), they offer an operating temperature range of -40°F to 221°F (-40°C to 105°C). These grommets provide good water resistance, are compatible with most moderate chemicals and wet or dry organic acids, and also help dampen vibration.