The 6" Vacuum Chuck Head can hold convex or concave shaped workpieces. Made of glass filled nylon with an aluminum mounting adapter.1" x 8 TPI6" vacuum head onlyFor Hold Fast Vacuum Chucking System
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- 1" x 8 TPI
- 6" vacuum head only
- For Hold Fast Vacuum Chucking System
Holding botton of bowl the inner ring pulls away from chuck. I would like to see the ring set in like on the 3".