Based on this product's specifications, here are some alternatives and similar models
Triangular Hand File MEGA 69513 — 150 x 7.1 mm triangular metal file
Summary description:
Triangular hand file MEGA 69513, size 150 x 7.1 mm, designed for filing and shaping metal, wood and plastic in narrow or angled grooves. The triangular cross-section provides three cutting faces for chamfering, deburring and fitting edges in joinery and metalwork. Suitable for precision finishing, small repairs and tool maintenance.