NOVA 8321 Smooth Column Series Infinity Accessory Jaw Smooth Column Jaws provide strong grip for boxes, peppermills and similar work without marking the project Can be used for handy 'pin chuck' mounting of bowls for outside turning Longer grip than traditional Nova Pin Jaw - 42mm (1.64") versus only 34mm (1.34") Grips a 1/2" (12.7mm) - 1" (25.4mm) plus dowels Longer extension than Traditional Nova Pin Jaw (32mm (1.26") vs. 25mm (0.98") away from chuck face so inside/outside of bowl can be turned