Product description:
- anodized aluminum profile with transparent cover (sold separately)
- available length 6m
- profile end with plastic end cap (accessories sold separately)
- dimensions: dia. 55mm

LT213DI10538 - ALU PROFIL INTERLIGHT anod.
LT21310368 - TRANSPRENT COVER
LWT01ZASINTERLPCO - PLASTIC FULL END CAP

As a rule, both aluminum profiles and plastic diffusers have a positive length tolerance and can, therefore, deviate from each other by some millimeters.
Please consider linear extension with temperature variations.