The Clamp-On Stitching pony has smooth jaws at 2-7/8" wide to firmly grip your leathercraft project while stitching. It has a spring knob to easily open and close the jaws to clamp on to your stitching project. A spring knob allows you to secure the horse to surfaces up to 2-7/8" thick and rotate it to the right angle for your stitching project. Makes stitching a dream.