A quick learner from Pennsylvania says:
June 2, 2016
I have a 1/2 " Ribbed Channel Balance I want to replace. It Has a stamp code of 28HDK. I can't find what the "K" stands for. What do I need to order to replace this?
Tom from SWISCO responded:
June 3, 2016
I'm afraid I can't identify what you have based on this information. I recommend that you look at our Channel Balance Home Page and follow the steps in order to find the Series that best matches what you have.