Springs performing Retract-Rewind functions, popularly known as Seat Belt Springs, made from textured, rolled, hardened & tampered high carbon steel strips in coil form of various size range 7.0 mm to 8.0 mm wide & 0.20 mm to 0.30 mm thick.

The Spring is anchored in a plastic fitting, open on one side, attached with Retractor Shaft, around which the Seat Belt is wound.
Retract-Rewind Springs is a critical component for safety operation of Seat Belts of 4-Wheelers. Other uses are : Dog Leashes, Mechanical Clocks
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