PL60-Ż. Cast Iron Survey Bolt, III class altitude grid sign.
A cast iron survey bolt. Made of high-quality cast iron. The head is powder painted and chemically hardened. Used to mark III class altitude grids.
The sign reads "ZNAK WYS"
Head size - 60 mm
Total length - 170 mm
Mounting length - 100 mm
Mount width - 15 mm.