X-calibar Carbide Runner - 506 Series - 6" - 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, Designed for the racing enthusiast and demanding trail rider, 7/16* bar has 8* of controlling carbide and two 1* wear pads for excellent control and extreme wear resistance, Some models require drilling extra holes in the ski.