They have a 'ribbed shank' to suit a range of tube sizes.
Suitable for the following size tubes:
44.45 mm x 1.50 mm Bright Polished Aluminium Round Tube
44.45 mm x 1.50 mm ERW Round Steel Tube
44.45 mm x 2.03 mm ERW Round Steel Tube
|Weight - Kg||0.0090|