Abstract: A drill includes a shank and a body having an outer peripheral surface with a certain outer diameter and a distal end tapered surface of a certain distal end angle. The drill includes a pilot shaft portion projecting from the distal end tapered surface of the body and having a diameter smaller than the body and having an outer peripheral surface of a certain outer diameter. The drill further includes an odd number of twisted grooves extending from the outer peripheral surface of the body to the outer peripheral surface of the pilot shaft portion at a certain twisted angle, an odd number of main cutting edges formed on the distal end tapered surface of the body by forming of the twisted grooves, and an odd number of auxiliary cutting edges formed on the distal end tapered surface of the pilot shaft portion by forming of the twisted grooves.

Abstract: a sleeve puller for pulling out a sleeve inserted in a panel, the sleeve having an inner wall that defines a hole, the sleeve puller including: a sleeve-engaging rod having a distal end and integrally including a sleeve-engaging portion, a screw rod continuous with the sleeve-engaging portion, and a wrenching portion continuous with the screw rod and opposite from the sleeve-engaging portion across the screw rod, the sleeve-engaging portion having a screw thread therein and having a tapered shape having a diameter smaller toward the distal end of the sleeve-engaging rod; a nut support including a slidable surface, a nut supporting surface opposite from the slidable surface, and a through hole extending throughout the nut support from the slidable surface to the nut supporting surface so as to allow the screw rod of the sleeve-engaging rod to be inserted therethrough; and a nut.

Abstract: a sleeve puller for pulling out a sleeve inserted in a panel, the sleeve having an inner wall that defines a hole, the sleeve puller including: a sleeve-engaging rod having a distal end and integrally including a sleeve-engaging portion, a screw rod continuous with the sleeve-engaging portion, and a wrenching portion continuous with the screw rod and opposite from the sleeve-engaging portion across the screw rod, the sleeve-engaging portion having a screw thread therein and having a tapered shape having a diameter smaller toward the distal end of the sleeve-engaging rod; a nut support including a slidable surface, a nut supporting surface opposite from the slidable surface, and a through hole extending throughout the nut support from the slidable surface to the nut supporting surface so as to allow the screw rod of the sleeve-engaging rod to be inserted therethrough; and a nut.