This crimping tool lug die set is for copper crimping applications and made for use with the RIDGID RE 12-M manual hydraulic crimp tool. It includes dies with 8, 6, 4, 2, 1, 1/0, 2/0, 3/0, and 4/0 AWG capacity: dies of 250, 300, 350, 400, 500, 600, and 750 kcmil capacity: and colour codes blue, grey, brown, green, pink, black, orange, purple, yellow, white, and red.