Easy buttonhole sewing machines (right), brand Juki LBH-780, stitch rigid regulate the number of stitches between 54 and 345 is done by changing the cam, raising base to 12 mm, maximum sewing speed is 3600 imp / min, buttonhole length adjustable between 6.4 and 38mm, the needle is DPx5 system, induction motor supplied at 380V or 220V.