The BlueSpot Ratchet Crimping Tool is manufactured from heavy-duty, hardened steel and fitted with durable plastic handles. Spring-loaded crimps provide a high-quality crimp each time. The jaws can be replaced if necessary. There are 3 coloured dots on the jaws which correspond to the correct terminal sizes: Red: 0.5-1mm², Blue: 1.5-2.5mm², Yellow: 2.6-6mm². Ref: UTTK5224