Based on this product's specifications, here are some alternatives and similar models
Triangular File AWTools AWTOOLS PILNIK TRÓJKĄTNY PROF 20 cm — AWTools AW32710
Summary description:
Triangular metal file AWTools AWTOOLS PILNIK TRÓJKĄTNY PROF 20 cm (model AW32710) designed for filing and deburring in corners, grooves and sharp angles. The profiled three-sided section provides precise material removal on metal, wood and plastics. Suitable for workshop, metalworking and DIY tasks requiring access to tight angles and accurate shaping.