| 摘要 |
There is disclosed a screw (10) comprising a shank (14) having a head (12) at one end and a cutting tip (16) at the other end. A thread (15) is formed on the shank (14) and extends at least partially between the head (12) and the cutting tip (16). At least one wing member (20) is provided on the shank (14) between the head (12) and the thread (15). The at least one wing member (20) comprises a body that extends radially from the shank (14) to terminate in a distal end face (23). The distal end face (23) of the body is configured to provide a first cutting edge (23a) that extends along a leading edge thereof. The body further comprises a second cutting edge (24a) extending along a leading edge of a lower face (24) of the body. The lower face (24) of the body extending from a lower end of the distal end face (23) to the shank (14). Fi. |
