Hand tool designed to attach large 15 mm (5/8") sew‑on snaps securely to firm, heavy‑weight materials. Provides even pressure to help seat the stud and socket cleanly without crushing the cap. Use on coats, costumes, uniforms and bag flaps where a strong snap closure is required. Compact design suits on‑site repairs and classroom kits and pairs well with matching large snap refills. Follow the package directions and test on a scrap to confirm compatibility.