Wm. Smith & Son Adjustable Left Handed Sailmaker's Sewing Palm;

The Sailmaker's Palm is designed for those working with touch materials like canvas or heavy nylon. It consists of an adjustable leather strap with buckle and thumb hole, together with a metal plate set in rubber. The sewing needle is set in one of the divots in the metal plate, and the sailmaker then uses the palm to push the needle through the material. Any time you're hand-sewing heavy materials like canvas, nylon, or even leather, you will want a Sailmaker's Palm.