Murray Abrasion Shield part# 740209MA has an inside diameter of 1/4" and an outside diameter of 2-1/4". This shield was used on the following trimmer mower models; TM5000X50B, TM5000X50C, TM5000X50D, TM5000X51B, TM5000X51D, and TM5000X89A. There may be models that use this part that we do not have listed here. Please refer to your owners manual or a parts breakdown for your model, to assure that this is the correct part for your machine, before you order.