Stainless steel hose clamps. You can find clamps for less, but then they must be replaced when the screw rusts away. These quality clamps are all  stainless steel including the screw! The one-piece housing is locked to the band without spot welds. The band is 9/16” wide and the screw has both a slotted head and a 5/16” hex.

Sizes:

• #5 fits 3/8"
• #8 fits 1/2"
• #10 fits 5/8"
• #12 fits 3/4"
• #16 fits 1"
• #20 fits 1-1/4"
• #24 fits 1-1/2"
• #32 fits 2"
• #52 fits 3"
• #64 fits 4"