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Offered SD Shanks are the drilling shanks provided in flat face and concave structures. Offered with electric power source and 4 inch to 12 inches dimension, these are used for the drilling work in both ferrous as well as non-ferrous metals. Eliminating all the drilling problems, these can make holes in plastic, metal and wood. These easy to use mechanisms are provided with light weight structures as well as sharp cutting flute patterns. The SD Shanks are provided with proprietary heat treatment procedures so as to ensure extended service life. These are also offered with compressive residual stress layer that are added to boost their resistance power against metal fatigue.