Using your Klein 44001 - BLK lockback knife is easy. To open it, just use the reversible thumb stud with one hand. You can carry it around easily by attaching the removable pocket or belt clip. When using the knife, always make sure the blade is locked in place for safety. After use, clean the blade with a dry cloth to keep it in good condition. Avoid using it on extremely hard materials as this may damage the AUS 8 stainless - steel blade. Store it in a dry place to prevent the black anodized - aluminum handle from getting corroded.