Y.T. UFO Indexable Holder Carbide - Blade Diameter 13 - 17mm - Overall Length 120mm - Neck Diameter 9.9mm (CB3W-1210-120-15)In long overhang machining, carbide shank provides relatively better stability and enhance the tool life of the insert than HSS shanks, despite it is always more expensive, but at the same time carbide shank improves the vibration resistance and the durability. Whether it is used in T slot insert or in thread milling insert, it is recommended to use carbide shank to reduce the cost by more than 50%. Different shank can fit in different dia. of inserts