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The design on the basis of the existing nails, making scale information such as aslength and diameter of the nail. It solves the users ( such as operaters )control the actual needs of nail length effectively when they drive in a nail. It also makes it easier for users to buy and identifying the required length of the nail. The design contains a series of nails with different length and diameter dimensions.According to the actual needs of users , it can be nailed to the corresponding scale (length) of the nail