Hook for opening manholes intrinsically safe tip KNM-1-300

Hook tip opressovannyh copper intrinsically safe KNM is made of steel with a diameter of 10mm, the total length of hook is 300mm. The point of the hook opressive copper, the thickness of the copper layer is 2mm, the length of the copper layer 100mm. Rod painted composite paint. The hook is used for opening metal hatches of communication wells in order to prevent sparking and fire and explosion.