Extreme Max Trailer Accessories – Trailer Trax Kits (Single) – Installing trailer trax is simple and to determine the location that works best for how to trailer. Use the self tapping screws provided and a power screw driver to fasten trailer trax at one end with two screws. Proceed to place screws every 12 inch. Fasten center sections according to the illustration. Features the perfect combination of grooved guide system and low profile design. Complete system for 1 snowmobile in 8 x 10 trailer. Engineered to be effective on both exposed and enclosed trailers. Traction grips included mounting hardware included, kit includes 4-5 inch Ski, track 4-15 inch, traction bars 75-self tapping screws. Note screw pack contains 75 screws.