A stitching clam is a wooden tool with two arms used to hold materials, especially leather, securely while it is being hand-stitched. They’re joined in the middle with an adjustment screw that can make the space between the arms wider or narrower, ensuring a tight hold around the specific leather being worked on.
While similar to stitching ponies and stitching horses, the stitching clam is a little more simple and just slides under one leg for support. Its position can be adjusted for the proper angle of stitch access, as well as personal comfort. If one does a fair amount of hand-stitching, with smaller to medium-sized leather pieces, a stitching clam might be a help.