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Unifiber Mast Extension Ring and Pin SDM, fits many brands of extension.
An adjustable collar for SDM Elite Extensions featuring a with fiber reinforced plastic collar with a stainless steel inserted ring. The “classic” ring + pin function proofs to be the most solid and trouble free mechanism to operate in a variety of conditions. The stainless steel insert will prevent the collar from deforming when rigging sails which require high amounts of downhaul force.