Anti-Slip Tread

The ramp leading into my tool shed has gotten a nice slippery green patina. To help prevent slipping I created this, it's a 9" x 2.5" ~(23cm x 6cm) triangle textured tread with 6 holes for #10 x 3/4-in Screws.

I designed this small enough so the it can be printed in batches of three.