MATERIAL: Use stainless steel material, security guards, Kitchen Household tool. Nut Cracker Pistachio Nut Opener with Stainless Steel Handle Nut OpenTool Sunflower Seed Plier MULTI-PURPOSE: The nut picks, works great for melon seeds,pine;sunflower seeds, and many other small seeds and. NUT CRACKER SIZE REFERENCE: 8.3*5.7cm(3.26*2.24''), the hole diameter is 6mm, 8mm, 9mm,does't apply to too large. DESIGN: Line design according to ergonomic principle, fit fingers, easy to use, practical melon seeds opener.