UL820 adopts single straight needle ,janpan-aligning thread,and vertical rotating spindle hook threads to form double thread lock stitches.The upper and lower axis adopts spiraling bevel gear,cylindrical seaming stand and rolling press foot,which is convenient for vertical and zigzag seaming ,Applicable to the corner seaming of leather shoes ,sports and lea ther bags. Hinged, rotating shuttle hook; easier to mantain, beautiful in design; metal plating enhances the surface abrasion resistance.