Daystar, Universal Firewall Boot, 5 Pack, Accommodates 3/8" to 1" Diameter Wire Bundles, fits any vehicle that needs a wire loom, KU20041BK, Made in America Trim-to-fit 3/8 inch, 11/16 inch, and 1 inch diameter wire bundles Protects wires from sharp edges; prevents wire chafing and shorts Works great for wires, tubing, and air lines Requires drilling a 1.25 inch diameter hole