Large-size linkage rod boots for 4mm & 4-40 linkage rods. These heavy-duty linkage boots will help stop water from seeping in around your steering linkage or wiring exiting the hull. Approx: 40mm long. Includes: 2 boots in a pack. Options: Black, Blue, Red, or YellowThese will stretch to fit up to a K & S #8134 11/32" (approx 8.75mm) brass tube.