Take this model, clients used to put it on office seating system, they also wide-used in various industries, mushroom head with square neck.
1. M6-1.0 length: 20 ~ 150mm
2. M8-1.25 length: 20~150 mm.
3. M10-1.5 length: 20~150 mm.
4. Head diameter: upon request.
5. Inch size is also available.