[Heavy-Duty & Rust-Resistant] Made of premium high-carbon steel with a blackened surface, this crimping tool is rust-proof and corrosion-resistant against seawater and salt spray, ensuring long-lasting durability. [5 Crimping Sizes & Wide Application] Features 5 precise crimping sizes: 1/16" (1.58mm), 3/32"-7/64'' (2.5-2.8mm), 1/8" (3.17-3.5mm), 5/32" (4.0mm), and 3/16" (5.0mm). Compatible with copper and aluminum sleeves for 50-450lb test wires. Ideal for railing systems, fishing lines, hammock ropes, wire rope cables, tent cords, dog leashes, etc. [Professional Crimping] Designed with 0.19inch/5.0mm thick jaws for strong and secure crimps, ensuring consistent, precise crimping without jamming or misalignment. [Simple & Efficient Operation] The optimized leverage design allows effortless crimping with minimal hand force, ensuring smooth operation and reducing fatigue during prolonged use. [Comfortable Grip & Safety Lock] Equipped with a non-slip ergonomic handle for a comfortable and secure grip. The built-in safety lock keeps the tool closed when not in use, ensuring safe storage. 123