HEAVY DUTY: This ratchet crimping tool has heavy duty plastic grip handles and hardened and tempered jaws. ACCURATE: With a ratchet action for consistent results, the crimper has a colour-coded dye for insulated crimp ferrules. SIZES: The tool is suitable for sizes 0.5 - 1.0mm, 1.5 - 2.5mm, 4.0 - 6.0mm.