Clamp Collar Double Split Inside Diameter Shaft Collar Clamp Type Zinc Plated Black Oxide Finish 13mm 15mm 16mm 20mm 25mm 30m Features: Shaft Collar - Single Split Clamp Type Collar Black Oxide Finish there is an odd which are zinc plated Item specification ID 13mm + 0.10mm to + 0.02mm OD 30mm Width 11mm, M4 Din 912 Cap Screw, Grade 304 A2 Stainless Steel,13mm Two Piece Clamp Type Collars ID 15mm + 0.10mm to + 0.02mm OD 34mm Width 13mm, M4 Din 912 Cap Screw, Grade 304 A2 Stainless Steel,15mm Two Piece Clamp Type Collars ID 16mm + 0.10mm to + 0.02mm OD 34mm Width 13mm, M5 Din 912 Cap Screw, Grade 304 A2 Stainless Steel,16mmTwo Piece Clamp Type Collars ID 20mm + 0.10mm to + 0.02mm OD 40mm Width 15mm, M6 Din 912 Cap Screw, Grade 304 A2 Stainless Steel,20mmTwo Piece Clamp Type Collars ID 25mm + 0.15mm to + 0.02mm OD 45mm Width 15mm, M6 Din 912 Cap Screw, Grade 304 A2 Stainless Steel,25mmTwo Piece Clamp Type Collars ID 30mm + 0.15mm to + 0.02mm OD 54mm Width 15mm, M6 Din 912 Cap Screw, Grade 304 A2 Stainless Steel,30mmTwo Piece Clamp Type Collars Material:: Aluminum alloy Specifications: 13mm, 15mm, 16mm, 20mm, 25mm, 30mm Quantity: 1 Packing list: 1*Fixed rings _x000D_