Thule Fabric Clamps. Fabric clamps to prevent the awning fabric from flapping. These clamps provide a more secure attachment of the awning fabric to the awning tension rod or blocker tension rod to avoid the unpleasant noise of a wind-flapping awning fabric. The clamps fit universally on most tensioning poles, simply snap into place, place the fabric between them and tighten with the handle. You can use up to 2 clamps on one side of the awning. One set contains 2 pieces. Suitable for the oval Blocker tensioning poles, Thule Tension Rafter G2 and the TO 1200 square telescopic tensioning pole.