A metal pin with incised threads and a broad slotted head that can be driven as a fastener by turning with a screwdriver, especially.
一枚有切割的螺纹和宽头的金属钉，可以用螺丝刀拧入以作为紧固物，尤指。
2
Ease of clamp mounting is facilitated by a large knurled knob on the bottom of the stand which is also slotted so that a coin or screwdriver can be used, if desired, to tighten the clamp. FORM No.