The ZT 0610ST is the automatic choice. It features the speed of automatic opening and the security of the ZT Push Button Auto Lock. The lock operates with just the push of a button, but has a secondary slider lock that prevents the button from being accidentally depressed and deployed. Match that security with a 154CM stainless steel tanto blade and lighter weight aircraft aluminum handles and you've got an impressive knife with save-your-life dependability.Includes a dual mounting system for tip-up or tip-down right-handed carry. Made in the USA.Please note: The sale of automatic knives is Federally regulated. Always check permissibility within your State or locality as non-Federal personnel may be precluded from ownership or use by State law.