This paper explains how to make a chain tool, a class of chasing tool which lets you make organized, regular rows of round dents for borders, frames, bands and decorative repeated marks. Different shapes are possible, and the registration bumps on the tool let you automatically extend a decorative line or row, otherwise very hard to do with chasing tools. More complex patterns can be placed between the registration bumps allowing complicated rows of marks. The same idea can make rope-like lines of marks. Tool steels, sources and hardening and tempering are addressed. Chain tool information is not available elsewhere. Includes 30 black and white step-by step photos. 37 pages, 8.5" x 11", saddle-stitch binding, black and white interior ink.