What's the name of this plastic piece that holds the tightening

KNAPP®-Dowel self-tightening plastic dowel - KNAPP® Connectors

The Geepres DynaMate® 4326 Plastic Mop Holder with SS Spring Yoke holds your mop tight and makes changing mop heads a snap! Immune to rust and

Geerpres 4326 DynaMate® Plastic Holder Only with SS Spring Yoke

6inch Large Spring Clamp Heavy Duty Clip Soft Jaws Plastic

1 Box (1,000 units) at $0.13 each unit, Quantity, 1 - 9 Boxes, 10+ Boxes, 25+ Boxes, 50+ Boxes, Price/Unit, $0.13, $0.12, $0.11, $0.10

Pull Tight Plastic Seals – Model PTS-8005 ($0.13 per unit)

Looking to rapidly and securely cap bottle and containers? Use this semi-automatic capper to securely attach plastic caps onto plastic bottles!

Bottle Capper/Capping Machine for Plastic Cap Tightening on Bottles and Containers – Technopack Corporation

3 Piece Air Tight Food Storage Container Food Grade Microwave Dishwasher Freezer Safe Keeps Fresh at Rs 80/piece, Food Storage Containers in Jamnagar

Pull-tight plastic seals Hectorseal LT 7.5x510 mm - LeghornGroup

55 Gallon Plastic Drum, Tight Head, UN Rated, Bung Fittings - Blue

250ML Round Pet Jar With Cap

5 Gallon (18L) Natural HDPE Plastic Tight Head Container w/Cap, 63mm, Open Vent Stem

30Pcs Two Hole Plastic Stopper Cord Lock Tighten Spring Cord End