INTERMECC Mod. BM20 is an automatic machine for fixing steel-shank on shank-board through one rivet or two rivets. Riveting is made through an electric motor movement; all other moviments are pneumatic. Machine can put one rivet on heel side or one rivet on forward side. It is very fast to pass from right shank-board to left one and viceversa thanks to few adjustments needed. A special centering system gives a very high precision; another special device makes machine able to coupling perfectly the shank-board radius and the steel-shank one, removing space between them, and making a very stable fixing. Machine BM20 has a very strong structure so that it can rivet even very hard materials. Production is very high, about 1400 pair per hour.