a rotary drill bit for boring a hole through a solid body is disclosed . the drill bit comprises a collar and a penetrating member . at a proximal end , the collar is attachable to a drill shaft . at a distal end , the collar is attachable to the penetrating member . the penetrating member has a connecting end for attachment to the collar and a cutting end for engaging the solid body . a pilot drill is fixedly attached to the cutting end for initiating contact with the solid body .