Abstract: A drill includes: a drill housing having a chuck collar of the drill made as a polygonal prism or a cylindrical collar having at least a secant flat surface formed thereon, a central drilling tool axially mounted in the drill housing, and a sleeve member having a hollow bore portion centrally formed through the sleeve member, having a coupling adapter formed on a proximal end of the sleeve member concentrically detachably secured to the chuck collar of the drill housing and having a screw driver member detachably mounted on a distal end of the sleeve member, whereby upon coupling of the sleeve member secured with the screw driver member onto the chuck collar of the drill, the hollow sleeve member on the drill will encase the central drilling tool previously axially mounted in the drill housing without first dismantling the central drilling tool for convenient replaceable uses of the drill.