Features: - brand new and high quality - Made of high quality material, durable - Industry standard - interchangeable - normal type - anti-corrosion treatment - Material: Aluminum Alloy - Size (inner diameter): 12mm, 20mm, 25mm, 30mm, 35mm, 38mm (optional) - Quantity: 1 piece - Color: Silver Specification: -ID 12mm + 0.10mm to + 0.02mm OD 28mm Width 11mm, M4 Din 912 Cap Screws, Black Oxide Oiled, 12mm Two-Piece Clamping Ring -ID 20mm + 0.10mm to + 0.02mm OD 40mm Width 15mm, M6 Din 912 Cap Screws, 304 Grade A2 Stainless Steel, 20mm Two-Piece Clamping Ring -ID 25mm + 0.15mm to + 0.02mm OD 45mm Width 15mm, M6 Din 912 Cap Screws, 304 Grade A2 Stainless Steel, 25mm Two-Piece Clamping Ring -ID 30mm + 0.15mm to + 0.02mm OD 54mm Width 15mm, M6 Din 912 Cap Screws, 304 Grade A2 Stainless Steel, 30mm Two-Piece Clamping Ring -ID 35mm + 0.15mm to + 0.02mm OD 57mm Width 15mm, M6 Din 912 Cap Screws, Black Oxide Oiled, 35mm Two-Piece Clamping Ring -ID 38mm + 0.15mm to + 0.02mm OD 60mm Width 15mm, M6 Din 912 Cap Screws, Black Oxide Oiled, 85mm Two-Piece Clamping Ring Package Included: 1* clamp ring (optional) Notes: 1. Due to various factors such as display brightness and light brightness, the actual color of the product may be slightly different from the website picture. 2. Please allow a slight deviation between the data and the manual measurement.