Custom Copper Wire Spiral Communication Compression Spring 915MHz 868MHz 433MHz Helical Antenna Spring - China Antenna Spring, Gas Spring | Made-in-China.com
M5-0.8 Threaded Insert DIN 8140-1 SL Type Wire Helical Inserts Stain
Set of compression and torsion elastic coiled springs. Helical wire winding in springy cylindric metal parts. Use in machine-building or vehicles Stock Photo - Alamy