Columbia River Knife & Tool - CRKT - My Tighe Assisted Opening Black Framelock Knife with Part Serrated Black Blade: Model CR-1091K. 4 1/2" closed framelock. Black coated stainless steel part serrated blade with dual thumb studs. 420 J2 stainless black finish frame with carbon fiber textured black Zytel onlays. Black Teflon coated stainless pocket clip. Features the OutBurst assisted opening system.