AUTO STRONG the brand of Di Chun, manufactures manual chucks that are widely used, occupying over 50% market share domestically. Manual chucks are mainly utilized as fixtures for clamping workpieces. Manual chucks are typically composed of mechanical components such as threads, bearings, and gears. Manual chucks don’t require an external power source only need through manual operation to achieve clamping and releasing. They are primarily installed on CNC lathes, traditional lathes, grinding machines, milling machines, vertical lathes, and 4” axis rotary table.