Feature: The product can used to prevent screw loosening. Surface is treated with galvanizing, the product has good anticorrosion performance. GB International Standard for more products After the screw nut is tightened, the cotter pin is inserted into the nut slot and the bolt tail hole, which can effectively prevent the screw from loosening. A variety of models are available and you can choose from them as needed. Specification: Material:Iron with galvanization Application: Screw, Bolt Model: M5*30, M5*35, M5*40, M5*50(Optinoal) Package list: Model Product dimension Package list M5*30 d: 5mm; l: 30mm 50pcs M5*35 d: 5mm; l: 35mm 50pcs M5*40 d: 5mm; l: 40mm 30pcs M5*50 d: 5mm; l: 50mm 30pcs Note: The actual product color may deviate from the photo due to light. There may be a slight deviation in the measurement of product dimensions. 1、The product can used to prevent screw loosening. 2、Surface is treated with galvanizing, the product has good anticorrosion performance. 3、5mm GB International Standard for more products. 4、After the screw nut is tightened, the cotter pin is inserted into the nut slot and the bolt tail hole, which can effectively prevent the screw from loosening. 5、A variety of models are available and you can choose from them as needed.