Abstract: An electric hand drill set includes a case constituted by a casing closeable by a cover to define therein a first interior space and a second interior space. A hand drill is received and removably held within the first interior space. A power converting and supplying device, such as an adaptor, is received and removably held within the second interior space. The power converting and supplying device has an extension cord adapted to connect to an external power source. The hand drill has and is powered by a rechargeable battery set which is electrically connectable to and thus chargeable by the power converting and supplying device. The charging of the battery set is indicated by a charging indicator. The cover has a window formed thereon, opposing the charging indicator to allow user to monitor the charging of the battery set.