Most Zero Tolerance knives require a Torx bit #6, Torx bit #8, or Torx bit #10 to fit into the head of the screws. The Torx #6 fits the pocketclip screws and the Torx #10 fits the handle screws on most current model Zero Tolerance knives. The Torx #8 fits most pivot screws though some models require a 3/8-inch hex socket.
Please be sure to use a Torx bit and not an Allen bit, this is a common error. The slight difference in shape will strip the heads of the screws. Torx tools are usually available for purchase at both online and brick-and-mortar hardware retailers at relatively inexpensive prices. It may be a good idea to have your knife with you when you are shopping to ensure you purchase the correct size bit/s. We offer bit sizes #6, #8, and #10 in our TX Tool.
If screws on your knife are coming loose frequently or you think the holes may be stripped, try using some blue Loctite and let the Loctite set up for 24 hours before using your knife. Please feel free to contact Zero Tolerance Warranty Service if you have any questions.