First, we confirm that the T-bolt clamps you ordered were explicitly specified as "3 inches"—and the products we shipped to you are indeed 3 inches in size, which fully matches the order requirement you provided. However, we note your feedback that the clamps are not usable for your 86mm outer-diameter pipe. It is important to clarify that you did not inform us in advance that the clamps would be used for an 86mm pipe; you only communicated your need for 3-inch clamps. Since we fulfilled the exact size you requested, we bear no responsibility for the mismatch between the clamps and your specific pipe application (a detail not shared during the order confirmation process). We are willing to discuss possible solutions if you have further needs, but we hope to clarify that we have not deviated from the agreed-upon order specifications.