Patent ID: 8052156

Claim:
A bit holder comprising: a shank provided with a combining hole having part of its inner wall formed with female threads for engaging with a bit sleeve; said bit sleeve provided with a through hole for being inserted with a bit and provided with male threads and an outer surface portion, said male threads being engaged with said female threads of said combining hole of said shank, said outer surface portion employed to be bit by an auxiliary tool so as to keep said bit sleeve fixed in or loosened from said combining hole of said shank; and said male threads of said bit sleeve to be engaged with said female threads of said combining hole of said shank after having said bit inserted in said through hole of said bit sleeve, said outer surface portion being held and controlled by said auxiliary tool to rotate so as to enable said bit sleeve fast engaged with said combining hole of said shank, an rear end surface of said bit sleeve resting on an annular portion of said bit after a complete engagement of said bit sleeve and said shank, wherein said bit has a combining portion for engaging with said combining hole, and said combining portion is larger than an inner diameter of said through hole of said bit sleeve so that said combining portion cannot pass through said through hole of said bit sleeve.