Torsion 70KG Right B/G (SPROTOR70KGR)

A 70KG Right-Wound Torsion Spring with a Black Winding Cone and a Green Stripe (often designated as B/G) is a heavy-duty mechanical component engineered to counter-balance sectional garage doors

B/G (Black/Green): Industry standard colour-coding markers. The Black indicates the cast-aluminium winding cone installed at the end of the spring. The Green stripe across the coil body indicates its specific wire diameter and lifting capacity class.