Cutex Brand HIGH SHANK SHIRRING / GATHERING FOOT WITH ADJUSTABLE BLOCKS #S950 High Shank Industrial Single Needle Sewing Machine Adjustable Shirring / Gathering Presser Foot with Low & High Step Block. HIGH QUALITY FOOT # S950 Adjustable Shirring Foot with High & Regular Blocks. The block controls amount of shirring. Use regular block for regular shirr or higher block for more shirr. Fits most single needle industrial sewing machines. For Maching Models, Please refer description below.