Zero Tolerance knives are designed and built to handle serious missions. This Rick Hinderer design is no different. It has an integral index finger guard for secure handling. Dual thumb stud opening system and a quad mounting pocket clip system for tip-up, tip-down, left or right handed clip carry. Lanyard hole in the handle. Like all Zero Tolerance knives the 550 has premium materials, thoughtful design, heavy-duty and precise construction.