AUTOMATIC LOCK - Self locking mechanism allows blade to lock automatically and retract at the push of a button. NYLON COATED BLADE - Provides maximum blade protection. IMPACT RESISTENT CASE - ABS plastic with rubber over mold protects the case from accidental drops. STUD MARKINGS - Printed every 16 inches. HIGH CARBON STEEL - Provides the most durable blade and retraction spring. Automatic blade lock