My original rubber struts wore out through the rubber surface (the metal cut into the rubber with time and use and eventually cut through) and had to be scrapped. These new ones have a metal insert that keeps the rack's square metal surface from cutting into the rubber. They will probably last a few years longer than the originals. The rubber used in these replacement parts appears to be very durable and has excellent grip to secure your ladder to a vertical surface. I've had a few situations where my extension ladder was slightly off vertical at about 16 feet, but these rubber end caps held my slick house siding like glue. Definitely 5 stars! For a fair price of $9.95 and considering how good they are in terms of design and materials, I highly recommend them.
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