Margin of error: 0.05% – 0.4%
Colors: In respect with international rules or custom colors
Diameter inside: 51mm (For Olympic standard barbells)
25kg: 450mm
20kg: 450mm
15kg: 400mm
10kg: 325mm / 5kg: 230mm / 2.5kg: 155 mm / 1.25kg: 155 mm