Allows visual inspection, prevents corrosion, and provided a waterproof seal. Can be perfect used in marine and automobile applications. PROFESSIONAL CRIMPING TOOL: Ratcheting Wire Terminal Crimper features a ratcheting mechanism design with adjustable crimping compression. It has a steel jaw with color coded wire. GOOD PERFORMANCE: This wire crimper is made of premium industrial grade high strength chrome vanadium steel which is treated with black oxidation,rust and corrosion resistance. PRECISE RATCHETING MECHANISM: Wire connectors are crimped by squeezing the handle through a complete ratcheting cycle until the handle releases automatically. The wire connectors can be secured by the ratcheting to insert the wires into the crimp. ADJUSTABLE CRIMPING COMPRESSION: This terminal crimper with a ratchet that you can adjust the handle crimp strength by adjusting the roulette to uniform crimping each time. Colour:As Shown Material:plastic+Metal Package Contents: 1 x Wire Crimping Tool Wire Cable Connector Set Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.