Drill bit Ø7mm Diamond hollow drill bit with countersunk ring Ø17mm

Manufacturer: WENDT,
Type: 22814074 / S7-17,
Drill bit length approx. 74mm, 1/2” external thread.
The countersunk ring is adjustable and removable,
Weight: 158 g,
Application: Glass industry,
Condition: Good, second-hand