The Z-Tool System covers the history of auto lockout situations. Keeps it simple with one manual and 14 tools. Very thin and very hard stainless quality. Everything needed including all required accessories in one compact kit. The manual, now in it's 21st updated and revised edition is spiral bound so to open flat. It contains over 1500 models including a commercial truck section showing each opening method in step by step visual detail. It even illustrates the hand positions as the tools move through their motions. Having trouble at the job site? You'll have unlimited use of our free Technical Assistance Line which may be called direct from the job site via cell phone. This kit is in the hands of over 75,000 professional auto lockout technicians from locksmiths, police, sheriff and fire departments.