Features: - - Made of , 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, 38mm Two-Piece Clamping Ring Package Included: 1 x Clamp Ring (optional) Notes: 1. Due to various factors such as display brightness and lighting conditions, the actual color of the product may vary slightly from the image shown. 2. Please allow slight variation due to manual measurement.