Caterpillar grommets are plastic (Nylon or Teflon) grommet edging that assists in the protection as well as insulation of wires and cables from chafing due to sharp edges. Its slotted style is designed to be applied on irregularly shaped and round panel holes.

Teflon parts available with or without etch on Boeing and Step’ n Components part numbers. MS21266 Teflon parts come etched.