RT 54 (Type 3) 4.00 - 4.20 mm Spiral Chain

RT 7 (Type 5) 5.80 - 6.00 mm Spiral Chain

RT 10 (Type 7) 6.30-6.5 mm Spiral Chain

RT 15 (Type 8) 7.00-7.15 mm Spiral Chain

RT 20 8.30-8.45 mm Spiral Chain

RT 25 Spiral Chain