Brous Blades The Exo Linerlock Knife Blackout - 4-1/2" closed. 3-1/2" blackout finish D2 tool steel blade with thumb slot and extended tang with jimping. Features Brous Bearing system. Blackout finish 6AL4V titanium handles. 3-D machined, right-hand carry pocket clip. Comes with Allen wrench tool. Certificate of Authenticity. Serialized. Limited run of 500. Hardshell storage box.