http://www.coldsteel.com/60st.html
"To keep your pocket sword secure and close at hand and ready for action, the Talwar is aided by dual mirror polished pocket clips for ambidextrous operation and a unique removable thumb plate. The thumb plate allows the knife to be opened as it is drawn from ones pocket by snagging it on the edge of the pocket seam. It can also be used like a thumb-stud for one-handed opening operation"