The Model 510 bench crimper accommodates many interchangeable heads. Changing heads is easy; remove one bolt and a pin. The following heads cover the most common line sizes from 1.20mm through 2.86mm: 51-B4-887 (B4 sleeve); 51-C-887 (C sleeve); and 51-G-887 (G sleeve). Refer to the Nicopress Sleeve Chart.