# Quartz protection windows: 20/2 pack, 20/4 stack, 30/2 RustOff

- Source-Date (SAST): 2024-06-18 12:27
- Dest: both
- Review-after: 2027-08-31
- Status: current

## Facts

- L-LENS-QUARTZ/20/2 is a single Φ20 mm × 2 mm quartz protection window (650/1064 AR) for marking-lens and cleaning-torch protection.
- L-LENS-QUARTZ/20/2X is a pack of ten of the same 20/2 windows.
- L-LENS-QUARTZ/20/4 (Φ20 mm × 4 mm) can be replaced by two L-LENS-QUARTZ/20/2 used together.
- L-LENS-QUARTZ/30/2 is the Φ30 mm × 2 mm window for welding/cleaning torch protection and is the RustOff lens; it has no substitute.