It's comprehensive used in auto & motobike industries. The 3 points beneath the head are weld points. Sometimes points locate upon customer's requirement, as it welded. Then there's no more chance to move it away barring ruin it.
1. M5-0.8 length: 10mm ~ 80mm.
2. M6-1.0 length: 10mm ~ 80mm.
3. M8-1.25 length: 12mm ~ 90mm.
4. M10-1.5 length: 16mm ~ 100mm.
5. Inch size also available.