1、Stainless Steel: High performance and super strength, it can open all nuts that are effective for hard-shelled nuts, such as pecans, walnuts, almonds (such as black walnuts, hazelnuts, California walnuts, macadamia nuts, etc.). 2、Durable and Applicable: Use a metal tip to finely press the nut without damaging the kernel. The maximum crack size is 5 inches, which is suitable for most sizes of nuts. 3、Will Not Be Damaged: The solid stainless steel full crushing system will not break when crushing black walnuts and other hard-shelled nuts. 4、Compact Design: Triangular shape, easy to hold in your hand, can clamp the nut shell to prevent the nut from flying. It is an excellent choice for the kitchen, suitable for nut lovers (especially black walnut lovers). 5、Please Note: Made of stainless steel. The maximum size of the lock nut is 5 inches. Tip: You may need to crack once, then turn the hard-shelled nut and crack it once or twice.