When drilling having a hand-held drill the pliability on the bit is not really the key supply of inaccuracy—it's the user's palms. Hence, for this sort of operations, a center punch is frequently accustomed to place the opening center ahead of drilling a pilot hole. Center drill bits, figures 1 https://simonlkihe.blogpayz.com/34373799/not-known-facts-about-drill-bit-manufacturer