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 |