This is a pen clamp for Stabilo pencils with a 7.8 mm width.

With the height adjustment, you can adjust the right high for the scribe.

Dimensions pen clamp:

Outside 10.2mm and 14mm

Inside 7.8mm, hexagon shape

Dimensions height adjustment:

Inside: 11mm and 29mm high

Outside: 20mm x 40mm x 3mm for hold with a finger