The 3,3mm small belts are usefull in mecanical projects like my pendulum clock. You need two standard 19mm trapezoidal blades like these to get the splitter work: https://www.amazon.de/Trapezklingen-Teppichmesser-Ersatzklingen-Karbonstahl-Cuttermesser/dp/B0BP2CGFKF/ref=sr_1_2_sspa?crid=2QYLS79AITJTU&keywords=trapezklingen&qid=1680710137&sprefix=Trapezklingen%2Caps%2C94&sr=8-2-spons&sp_csd=d2lkZ2V0TmFtZT1zcF9hdGY&psc=1