EASY USE TIP ONE-HIT STRONG CRIMPS: Loading connector & cable then crimps with the aid of hammer. Recommend 2 to 4 lb sledgehammer, with a bigger hammer you don't have to hit it as many times. Also works well in a shop vise. Crimping Type: Indent. Terminal Type: Uninsulated.The V-groove base holds lugs securely for more precise and stable crimping. WIRE GAUGE: Crimps 8 gauge to 4/0 gauge connectors.8 AWG, 6 AWG, 4 AWG, 2 AWG, 1 AWG, 0 AWG, 00 AWG, 000 AWG, 0000 AWG. PROFESSIONAL CRIMP: Ideal for battery and welding cables.Reinforced steel construction delivers high-impact durability for long-term, repeated use.Engineered for secure operation. No loose parts, no broken springs unlike cheap hammer crimpers. Free returns and exchanges are available for any manufacturing defects.