Shop › Circular Chain Knocker, Sleeve for use with 12mm (1/2") cable Image 1 of 1 Circular Chain Knocker, Sleeve for use with 12mm (1/2") cable from $96.00 Pipe Size: Select Pipe Size 75mm (3") 10mm (4") 125mm (5") 150mm (6") 200mm (8") 250mm (10") 300mm (12") Quantity: Add To Cart Added!