The GE255-L National Aerospace Standard Slotted Grommet Edging protects and prevents wires and cables from chafing against sharp edges of panel walls and knockouts. Nylon material. Designed for 0.192" - 0.255" (4.9 mm - 6.5 mm) thick panels. 12.75" (323.9 mm) long. Color Natural White. 50 per package.