The MK Ultra is our smallest and lightest knife to-date. Everything was thought-out and engineered to make it as strong and reliable as possible! The stainless steel lock insert is completely captured by internal 3D machined pockets. The only visible portion of the lock is the generous jimping for lock release. The precision-turned 17-4PH pivots and standoffs have a +-.0002 tolerance. The MK Ultra features rolling bearing construction, with hardened stainless bearing races. We are a Hoback authorized dealer.