These Mountain Tactical Bolt Handle stems are designed to give you more control over your rifle. The longer handle makes cycling the bolt easier allowing you to eject and chamber a round without taking your sights off your target. The austenitic stainless steel handle stem is thread with an industry standard 5/16-24 thread to accept other Mountain Tactical Bolt Knobs or other knobs from manufacturers such as Badger Ordnance, etc. You can switch out knobs with ease.