Applied with the newly improved main shaft mechanism, ensured further durability, some parts of the thread take-up mechanism be plated with special material, could increase the strength & durability of the machine. Needle feed mechanism synchronously moves with lower drop feed, ensures fine and non twisted seams from slippery or difficult to feed materials, standard needle gauge I /4″ (6.4mm). Simple and quick gauge change. Automatic lubricating system, smooth and quiet running, easy maintenance. Equipped with the large hook, the bobbins has a twice large capacity than that of regular hook.This is convenient for long materials sewing as well as with thick thread.