Bolted these onto my HD bars to keep a stack of lumber from sliding, and the t-slot mount lined up perfectly with no drilling. Four in the set covers both bars, and the steel doesn't flex at all once tightened down.
George R.★★★★★
Bolted these onto my T-slot crossbars in about five minutes and they haven't budged since, even with a stack of lumber up top. The steel is thick and the t-slot fit was dead-on, no drilling or fiddling needed. Exactly what I wanted to keep heavy loads from sliding around.
Christopher★★★★☆
The steel construction feels genuinely heavy-duty, and they clamped my lumber down without any shifting on the highway. Only gripe is the bolts are a bit fiddly to tighten with the bars already mounted.