Those are Hose Clamps / Jubilee Clips 🔩
What they are:
• Type: Worm-drive hose clamps, also called "Jubilee clips"
• Material: Galvanized/steel, silver finish - looks rust resistant
• Sizes: You’ve got 3 different widths here. The 2 on the left are wider/heavy duty, the one on the right is narrower
How they work:
You slip them over a hose/pipe, then tighten the screw with a screwdriver or 7mm/8mm socket. The worm gear pulls the band tight and locks it.
What they’re used for:
1. Plumbing - securing water hoses, PVC pipes, tank connectors
2. Auto - radiator hoses, fuel lines, air intake hoses
3. Irrigation - garden hoses, pumps, sprinklers
4. General - clamping anything flexible to a pipe/fitting so it won’t leak or slip off