| 摘要 |
A screw fastener (10) including an elongate shank (11) having a longitudinal axis (A), a tip (12) at one end of the shank (11), a head (13) at the opposite end of the shank (11), and a self-tapping screw thread (14) extendi ng along at least a major portion of the shank (11). The head (13) includes a generally planar end face (17) which is generally perpendicular to the longitudinal axis (A), and which includes means (18) for cooperation with a screw driver. The head (13) further includes boring means (15) that permits the head (13) to bore into a sheeting substrate (20). Control means (19) are provided for controlling the depth of penetration of the head (13) into the sheeting substrate (20).
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