If you already own a rotary hammer and are looking for a heavy-duty drill to bore large holes in wood or mix joint compound, consider buying an SDS-Plus chuck adapter (shown in the third photo).

Compatiable with all SDS-plus rotary hammers, Bosch Power Tools' Bulldog Xtreme8 8-cutter SDS-plus concrete drill bits and the Blue Xtreme carbide-tipped drill bits includes either the PowerGrip ...