Product Description Spinnaker Pole Ring - Curved Base - 35mm(1-3/8") IDFeatures:Suits most common mast profilesGrade 316 Stainless SteelSpecifications:Material Ø: 8.0mm(5/16")Ring Ø: 35.0mm(1-3/8")Mast Ø: 60.0mm(2-3/8")Weight: 80g(2.8oz)