【Exclusive Special Jaws】Based on the usage feedback from customers, the shape of the jaws and the mold have been improved from the semi-arc shape commonly used in the market to a unique square shape. Thus reducing the error due to deviations. Jaws can now fit closer to the bollard. The crimping effect is more solid, smoother. Ensure good contact. 【Interchangeable Crimping Heads】This set provides 2 detachable crimping heads for different usage. They are suitable not only for crimping insulated terminals, but also for solder wire connectors. You are free to replace them as needed. More versatile and convenient. 【Crimping Range】Compatible with insulated terminals (0.5-1.0) / (1.5-2.5) / (4-6) mm²= AWG 20-10; Welding tube (1-1.5) / 2.5 / (4-6) mm². 【Solid Construction】Made from hardened alloy steel, which is hard and reduces roughness of surface. Maximizes the benefits of forced locking and automation of the crimper's unique mechanisms. Greatly improve crimping accuracy and save labor.