Colt A/O Rockloc Series AR-15-K Assisted Opening Linerlock. 4 1/2" closed. Bead blast finish 440 stainless tanto blade with ambidextrous thumb studs. Black CNC machined 6061-T6 aircraft aluminum handles with a scratch resistant hard anodized finish and non-slip Magna-grip inserts. Stainless pocket clip. Features the new patent pending, assisted opening Rockloc mechanism, designed by custom knifemaker Rocky Moser. Made in the U.S.A.