Specification Brand : Loboo Idea BulletPoint1 : [EASY TO INSTALL] Easy to install, replacement for the old or damaged one, reliable to use. BulletPoint2 : [HIGH QUALITY MATERIAL] Made from high quality aluminum alloy, wear-resistant and . BulletPoint3 : [FINE WORKMANSHIP] Using fine workmanship CNC technology for higher accuracy and durability. BulletPoint4 : [SPECIFICATION DETAILS] Female and male thread specifications are M42x0.75mm, ensuring compatibility. BulletPoint5 : [VARIETY OF SIZES] Various sizes from 3mm to 30mm suitable for different , providing versatility. Color : #034 Department : Unisex Adult IncludedComponents : 1 ItemName : Telescope Accessories, Digital Eyepiece,Lens Extension Tubes Adapter Kit Easy Install Astronomy Black 8Pcs Set ItemPackageDimensions_Height : 5 centimeters ItemPackageDimensions_Length : 19 centimeters ItemPackageDimensions_Width : 14 centimeters ItemPackageQuantity : 1 ItemTypeKeyword : camera-lens-extension-tubes Manufacturer : Loboo Idea Material : Aluminum alloy ModelName : Loboo Idea7uy0wtnb5a ModelNumber : Loboo Idea7uy0wtnb5a NumberOfItems : 1 PartNumber : Loboo Idea7uy0wtnb5a Pattern : Solid ProductDescription : [EASY TO INSTALL] Easy to install, replacement for the old or damaged one, reliable to use. [HIGH QUALITY MATERIAL] Made from high quality aluminum alloy, wear-resistant and . [FINE WORKMANSHIP] Using fine workmanship CNC technology for higher accuracy and durability. [SPECIFICATION DETAILS] Female and male thread specifications are M42x0.75mm, ensuring compatibility. [VARIETY OF SIZES] Various sizes from 3mm to 30mm suitable for different , providing versatility. Spec: Item Type: Lens Extension Tubes Material: Aluminum Alloy Color: Black Product Size: Approx.3mm / 0.12in, 5mm / 0.20in, 7mm / 0.28in, 10mm / 0.39in, 15mm / 0.59in, 20mm / 0.79in, 30mm / 1.18in, 12mm / 0.47in Application: Extend the focal length of the primary mirror of the astronomical telescope Extinction Treatment: Internal with extinction thread Interface Female Thread Specification: M42x0.75mm Interface Male Thread Specification: M42x0.75mm Package List: 1 x 3mm Extension Tube 1 x 5mm Extension Tube 1 x 7mm Extension Tube 1 x 10mm Extension Tube 1 x 12mm Extension Tube 1 x 15mm Extension Tube 1 x 20mm Extension Tube 1 x 30mm Extension Tube Note: 1. Please allow 1‑2in error due to manual measurement. Thanks for your understanding. 2. Monitors are not calibrated same, item color displayed in photos may be showing slightly different from the real object. Please take the real one as standard.