Made in Switzerland by Kaiser.
This is a NEW Boring Head Insert Cartridge. The set screw is missing.
Model #: 626.241
Specifications:
Type: Replacement Boring Head Insert Cartridge
Compatible Boring Head: EWB 41-54
Boring Head Series: 310
Set Screw: 10.694.122
Comes as shown in pictures.
-Ref 4-64