This is a Metra hard plastic SB1 Snap Bushing Grommet. SKU: SB1

These grommets are very basic to install and help to protect the wire as it goes through holes in your firewall. A must have when installing any power wires through your firewall. These keep the wire from being sliced and shorting out.

Inner Diameter: 0.68"
This grommet DOES fit my #FAM 4AWG OFC cable with or without flex loom.
*This grommet DOES NOT fit my #FAM branded 1/0 cable due to its oversized insulation.