Designed for the Tikka T3 and T3X, the Outdoorsman Bolt Knob by Mountain Tactical delivers greater control when manipulating the bolt even in adverse conditions or when wearing gloves. It features a larger diameter, as well as the industry standard 5/16x24" threading for use on all Mountain Tactical bolt handles and the handles of other manufacturers. Mountain Tactical T3/T3x Outdoorsman Bolt Knob T3T3XBHK-O