Here are some corrections and suggestions:
1. "set screw" is one word--not two. See the following two references:
2. I think "W shape screw head" might be Japanese-English (和製英語). The term "W shape" should likely be "cup-point," not "W shape."
Also, "screw head" is clearly wrong because the cup-point is NOT at the top (head) of the setscrew. The head of a setscrew will either be a an Allen-type head (for tightening with an Allen wrench) or a slotted-type head (for tightening with a screwdriver).
Finally, here is a list of different types of setscrews according to MachineDesign.com:
1. cup-point setscrews
2. cone-point setscrews
3. oval-point setscrews
4. flat-point setscrews
The RcTek site goes even further and offers wonderful illustrations of the different types of setscrew (grub screw) tips:
1. flat-point tip
2. domed-point tip
3. cone-point tip
4. cup-point tip
5. knurled cup-point tip
6. dog-point tip
Specific references/links:
1. Machine Design - Setscrews
2. RC Tek - Fixings & Fasteners - Grub Screws
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