Seco, 02417266, Counterweight, For Use With: Graflex Size 5 Bride Bar Boring Heads, Specifications: Connection text machine side: G5/Body diameter: 54.0 mm/Cutting diameter minimum: 50.0 mm/Cutting diameter maximum: 50.0 mm/Functional length 1: 79.0 mm/Overall length: 112.0 mm/Net weight: 1.652 kg