Durable and Applicable: Use metal tip to finely press the nut without damaging the core. The maximum crack size is 1.5 inches, suitable for nuts of most sizes. . Not Break: The sturdy stainless steel solid crushing system will not break when crushing black walnuts and other hard shell nuts. . Compact Design: Triangular, easy to hold in the hand, you can hold the nut shell, so that they will not fly around. Excellent addition to kitchen and suitable for those nut lovers (especially black walnut lovers). . Please Note: Made of all stainless steel. The maximum crack nut size is 1.5 inches. Tip: You may need to crack once, then turn the hard shell nut and crack once or twice. . Stainless Steel: Heavy-duty and super strong, can open all nuts such as pecans, walnuts, almonds, effective for hard shell nuts (such as black walnuts, hazelnuts, California nuts, macadamia nuts, etc.) .