Four jaws: suitable for most shelled nuts, pecans, hazelnuts, almonds, hazelnuts, macadamia nuts, etc. Remark : Cannot be used for hard black nuts. Material: Made of high quality aluminum alloy and Heavy-Duty design, the nutcracker won’t bend, rust or break no. Ergonomic design: The non-slip silicone handle is more comfortable to grip than an all-metal handle. Funnel structure to prevent nuts from falling. Keep intact: does not crush the shell and keeps the nut intact. Design: 90 saw teeth, easier to crack nut shells.