X-calibar Carbide Runner - 505 Series - 4" - 60? Sno-Stuff has completely redone and improved bar selection to better reflect industry changes, All bars feature extended studs for convenience, 60? controlling carbide is physically larger and stays sharper for greater control and longevity, 4* x 60? of controlling carbide provides great steering control and longevity, 1* tapered carbide wear pads front and rear provide exceptional wear resistance when d to traditional hard surface bars, Some models require drilling extra holes in the ski.