The Fast Break series is available with a flush toe (0mm) insert or XT insert (2mm). Top trainers are finding this to be a dream, especially on younger horses. Less stress on the upper limb, and better hoof condition as well, make it an excellent option on the racetrack. Punched for 3-1/2 Race, 3-1/2 Race XL, 4-1/2 Race or 4-1/2 Slim.