BTM’s Lance-N-Loc® Joining System produces clean, strong and consistent joints in most coated or uncoated metals. The joints are characterized by a “button” formed on the die side layer of metal and a recess formed in the punch side layer. The button is a good indicator of joint quality and therefore, simplifies quality control. Two or more layers of metal typically ranging in thickness from .008" (0.2mm) to .157" (4.0mm) per sheet can be reliably joined in most cases.