Cannot find this operator

Question

See photos for measurements and markings. There were no other markings other than the words truth and an arrow. Any insight to what part this is would be great! As a guess these windows were installed in about 2008.

Thanks!

Tom · Accepted Answer

Thanks for reaching out to us! Please take a look at our 39-187 and 39-188. I think these are exactly what you're looking for, but let me know what you think!