Item specification ID 13mm + 0.10mm to + 0.02mm OD 30mm Width 11mm, Din 912 Cap Screw, ,13mm Two Piece Clamp Type Collars ID 15mm + 0.10mm to + 0.02mm OD 34mm Width 13mm, Din 912 Cap Screw, ,15mm Two Piece Clamp Type Collars ID 16mm + 0.10mm to + 0.02mm OD 34mm Width 13mm, M5 Din 912 Cap Screw,16mmTwo Piece Clamp Type Collars ID 20mm + 0.10mm to + 0.02mm OD 40mm Width 15mm, M6 Din 912 Cap Screw,20mmTwo Piece Clamp Type Collars ID 25mm + 0.15mm to + 0.02mm OD 45mm Width 15mm, M6 Din 912 Cap Screw, 25mmTwo Piece Clamp Type Collars ID 30mm + 0.15mm to + 0.02mm OD 54mm Width 15mm, M6 Din 912 Cap Screw, 30mmTwo Piece Clamp Type Collars Material:: Aluminum alloy Specifications: 13mm, 15mm, 16mm, 20mm, 25mm, 30mm Quantity: 1 Packing list: 1*Fixed rings