This multipurpose nut cracker is made of high-quality stainless steel, made of high hardness steel, anti-rust and super reinforcement, it is not easy to deform and durable. Nuts opener approximate size is 3.2in/8.2cm*2.3in/5.9cm, the hole diameter is 0.2in/0.7cm,0.3in/ 0.8cm, 0.4in/0.9cm,does't apply to too large nuts. Line design according to ergonomic principle, fit fingers, easy to use, practical melon seeds opener.Simple convenient, for young and old. There are 3 positions for the size of the melon seed clamp, which can be freely adjusted to the appropriate size of the chuck, it is convenient for peeling, easy to use, safe and convenient, saving time and effort. It's an ideal shell-breaking tool for the hard shell foods such as seeds, pine nuts, citrons, peanuts, etc.