Here's a refined version of the description for Landing Trim (NTL) and Pre-formed Angles NSA290:

Landing Trim (NTL) and Pre-formed Angles NSA290 are essential for concealing the edge of floor coverings and stair edging neatly in an Aluminium Finish. They are available in angles of 83 or 90 degrees, fitting between the tread and riser of the step.

- Length: 350 mm

Additional Information:
Brand: Genesis"

This version clearly communicates the purpose, specifications, and dimensions of Landing Trim (NTL) and Pre-formed Angles NSA290, while also mentioning the brand for clarity.