The lock nut has a nylon insert to prevent it from backing out. Tighten with a 7/16" socket wrench. 3/4" wide 300 Series Stainless Steel Band and Trunnion. Zinc Plated T-bolt, Nut and Springs.
HPS Stainless 3.75"-4.06" HD Spring Load T-Bolt Hose Clamp for 3-1/2" ID Hose
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HPS Stainless Steel Embossed Hose Clamp 1-1/4" - 2-1/4" Range Size #28 Set of 6
