Hello Cheraud,
The: Titan TTB290SDR 3" Belt Sander 230V (51603) uses 533 x 75/76mm sanding belts.
The 120 Grit belts are:
Triton Alox Sanding Belts Unpunched 76 x 533mm 120 Grit 5 Pack (7306R),
Cloth Sanding Belts Unpunched 75 x 533mm 120 Grit 5 Pack (81379).
Thank you for using Q&A. (LM).
Answered by: LMac
Date published: 2018-01-04