Columbia River Knife & Tool - CRKT - My Tighe Assisted Opening Framelock Knife with Part Serrated Blade: Model CR-1091. 4 1/2" closed framelock. 1.4116 steel part serrated edge blade with satin finish and dual thumb studs. 420 J2 stainless bead blast finish frame with carbon fiber textured black Zytel onlays. Black Teflon coated stainless pocket clip. Features the OutBurst assisted opening system.