Milwaukee 48-20-5420 3-1/8" x 11-3/8" SDS-Max Core Bit. Milwaukee's 1-Piece Core Bits are specifically for drilling large holes at a shallow depth. These Core Bits come in a variety of diameters ranging from 1-1/2" - 6". This Milwaukee 48-20-5420 3-1/8" x 11-3/8" SDS-Max Core Bit features an asymmetric tooth pitch, alternating teeth, and a 1-piece design that maximizes energy transfer from the drill to the end of the bit. The fluted core exterior minimizes friction loss and removes debris faster.