Patent ID: 8528217

Claim:
An electric tool having an attachment portion, the attachment portion comprising, in a detached mode: an exterior wall having an inner surface facing a center of the attachment portion and having an outer surface facing away from the center of the attachment portion; an interlocked portion configured to be used for connection with a remote control holder; and guide rails extending from the exterior wall of the attachment portion toward the center of the attachment portion, wherein attachment of a battery pack to the attachment portion is made through sliding engagement such that slide rails provided on the battery pack are fitted inside and between the guide rails of the attachment portion, and wherein the interlocked portion is arranged as ribs on the outer surface of the exterior wall of the attachment portion and protruding therefrom away from the center of the attachment portion so as to be parallel to the guide rails such that the interlocked portion connects to the remote control holder outside the exterior wall of the attachment portion.