The X-tended Fit X-Chock offers the same great function as the 28010 X-Chock but for Wide Track axle spacings. Some OEM trailers are building frame with up to a 15 inch tire spacing. The new X-tended Fit X-Chock will adjust out to 17" to accommodate those speciality axle spacings. Common trailers with this configuration are: Bullet, PrimeTime, Passport, etc. One chock and one handle per box.