The 8G4025.0X3.5B is part of the Dremec HexBore Quick-Change Chuck System. It is an 8-inch wide, 4025-type three-way automatic quick-change closing tool that is designed for installation and removal of parts up to 3.5-inches in diameter. It is ideal for milling, drilling and reaming operations in a wide range of materials, including soft and hard steels, aluminum, plastic and composites. The 8G4025.0X3.5B's three-way automatic quick-change closing tool enables faster setup and part removal times compared to manual systems, and its design reduces the risk of operator injury during installation or removal. It has a fast release, anti-slip cap for added safety, and a robust body and jaws for reliability.