Locking mechanism press the spring button to adjust and fix the size of the plier jaw, which can quickly open the clamp and protect the finger There are optional CONVENIENCE: The widened jaw increase the clamping area and strength, which can easily deal with the clamp in various difficult states, such as strong, aging, rust, freezing, and so on meterials heavy duty hose clamp pliers make from materials, thick and high temperature, high hardness and rust resistance Features: the plier jaw make from metal welding process, which is strong and wear resistant, and there is none need to worry about damage and falling off during use, Manufacturer: Kaeltsyn