| 摘要 |
A screw driver is provided to improve the work efficiency by replacing a driver tap according to the work environment or damage and to prevent a safety accident. A screw driver(100) comprises a driver tap(10); insulator combined in the driver tap; a main body(30) including a handle part(32), a containing part formed in inside and being separated from the drive tap with the insulator; a first insulator pin fixing the driver tap, the insulator and the main body; an secondary tool(50) contained in the containing part; and reinforcements(70) covering a part of the main body, insulator and driver tap.
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