slotted head造句怎么写

4、nail of iron or steel (excl. copper-headed nails, pointed screw nails with slotted heads and unpointed screw nails)

2、a threaded fastener used either with a nut or with a tapped hole; slotted head can be driven by a screwdriver.

1、a fastener with a tapered threaded shank and a slotted head.

3、screw nail pointed with slotted heads, of iron or steel