Based on this product's specifications, here are some alternatives and similar models
Corner trowel MEGA 60×80 mm stainless steel – external angle tool model 61762
Summary description:
External corner trowel by MEGA, model 61762, with working face dimensions 60×80 mm made of stainless steel. Designed for finishing and smoothing external corners in plaster, cement render and other masonry or repair work. Compact stainless-steel construction provides corrosion resistance and easy cleaning; suitable for professional and DIY use where accurate corner profiling is needed.