290mm
Runner rail:
- Tempered steel, zinc-plated, blue passivated
- Raceways hardened
Balls: Roller bearing steel, hardened
Ball cage: Steel, galvanized
Running rail / running rail:
Heat-treated steel
- zinc-plated, blue passivated
- raceways hardened
Balls: roller bearing steel, hardened
Ball cage: Steel, zinc plated