| Mark (LG/AG Series) | Dust Proof | Condition |
| U (Standard) | End Seal + Bottom Seal | Normal Chips |
| DD | Double End Seal + Bottom Seal | Heavy Dust or Chips |
| KK | Double End Seal + Scraper + Bottom Seal | Heavy Dust, Heavy Chips, Heat Chips, Work Spark |
| ZZ | End Seal + Scraper + Bottom Seal | Heat Chips or Work Spark |