Screw driver

The utility model relates to a screwdriver which comprises a grip, a screwdriver head is arranged on the grip, and the screwdriver head is used for being melted and deformed when being heated, being matched with a notch of a screw in shape and being hardened after being cooled. The tool bit is sleeved with a protective sleeve used for preventing the tool bit from being heated, melted and lost. According to the screwdriver, the screwdriver head is melted at high temperature and inserted into the hole groove of the screw to deform, cool and harden, so that the screwdriver head can be adapted tovarious types of screws. And meanwhile, the outer surface of the tool bit is sleeved with the protective sleeve. Loss of the tool bit after melting at high temperature is prevented, and the situationthat the tool bit cannot be taken out of a hole groove of a screw due to bonding and fixing of the tool bit and the screw is avoided. 本实用新型涉及一种螺丝刀，包括握把，所述握把上设置有刀头，所述刀头用于在受热时熔化变形，并与螺丝的槽口形状相适配，及在冷却后硬化；所述刀头套有用于防止刀头受热熔化流失的保护套。本螺丝刀