Extension springs are helical wound coils with hook, loops.
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Wholesale tension spring with swivel hook To Build Your Next Automaton - Alibaba.com
Helical Extension Golden Spring, 3D Vector Model of Machine Detail. Tension Metal Spring with Hooks at the Ends. Stock Vector - Illustration of tension, golden: 236299142
304 Stainless Steel S Hook Cylindroid Helical Pullback Extension Tension Coil Spring Wire Diameter 0.6mm 0.7mm (Size : 85mm (5Pcs), Color : 7MM_0.6MM) : Amazon.ca: Industrial & Scientific
304 0.6mm 0.7mm Stainless Steel S Hook Cylindroid Helical Pullback Extension Tension Coil Spring - AliExpress
O Lock up Hook Coil Cylindroid Helical Extension Pullback Tension Spring Stainless Steel Wire Diameter 0.8mm 1.0mm 1.2mm (Size : 20mm (5Pcs), Color : 12MM_1.0MM) : Amazon.ca: Industrial & Scientific
SINEKY 5pcs Stainless Steel S Hook Cylindroid Helical Pullback Extension Tension Coil Spring Wire Diameter 0.3-0.5mm (Size : 20mm, Color : 5MM_0.4MM) : Amazon.ca: Industrial & Scientific
Mechanical Extension Extension Spring Cylindroid Helical Coil 304 Stainless Steel Open S Hook Pullback Tension Wire Diameter 0.5mm 0.6mm Steel Extension Spring : Amazon.ca: Industrial & Scientific