The model number of Kershaw's Secret Agent boot knife could be none other than 4007.This updated version of the boot knife features a single-edged blade with a non-reflective black-oxide finish. The blade is heat treated to Kershaw's demanding specifications to bring out the very best qualities in the steel. The black-oxide coating provides additional blade protection. For a secure grip, the handle is glass-filled nylon with a textured rubber overmold. The Secret Agent has a dual-carry molded sheath with a clip for convenient belt carry and slots to add your own leg carry straps. For additional versatility, the knife comes with a lanyard hole. Discreet and concealable for tactical use and personal protection, the Secret Agent is also viable for a variety of utility purposes.