I was worried a little whether the strength of the spring was appropriate until I received the product, but when I tried using it I was worried about the worry. I wanted the twisting (opening) angle really sharp objects, but since there was only a right angle object, I bought it and used it remodeled and it worked. (Although it was a delivery date, it was about 10 days, but there is a feeling that if it is a little earlier .... This is my selfishness so allow it.) Other than that it is completely usable. Since Mr. Tattaro has all kinds of goods, it is really reliable when it comes to emergency.