Rotating material of sleeve bore core and frictional material for two sides all adopt bakelite.
        The frictional strength is subject to either spring pressure or cylinder power to decide each torque assembly of slippage, for easy to control the tension adjustment in each material.
Specifications : 
3" Outer diameter : r75.5 mm
Expanded diameter : r79 mm/max
Inside diameter of paper tube : r76.2 0.2 mm
Remarks :
(1) Sizes of inside diameter can made by suitable shaft.
(2) Other sizes of outer diameter are available on request.