CORE BIT SET FOR POWER TOOL

PROBLEM TO BE SOLVED: To provide a core bit set for a power tool, in which a core bit and a shank part are stably fixed to each other without causing backlash and in which the core bit is attached to/detached from the shank part through good operability.SOLUTION: The core bit set for the power tool includes: a mounting shaft 21 to be mounted onto a power tool body; a fixed flange 22 fixed to the mounting shaft 21; and a push ring 26 and a movable flange 24 which are movable in an axial direction with respect to the mounting shaft 21 and the fixed flange 22, and further includes projections 23, 25 which are provided at outer circumferential surfaces of the fixed flange 22 and the movable flange 24, respectively. Engagement of the projections with a notch part 13 fixes the core bit 10 to the shank part 20. In the notch part 13, an axial-direction notch 13a extending in an axial direction, a first circumferential-direction notch 13b extending in a circumferential direction from the intermediate point of the axial-direction notch 13a, and a second circumferential direction notch 13c extending in the circumferential direction from a lower end of the axial-direction notch 13a are formed. Further a lock part 13g for limiting movement of the movable flange projection 25 is provided at a terminal of the second circumferential-direction notch 13c.