Specification Brand : WEERAS BulletPoint : Integrated Upper Headset For 1-1/8" Or Tapered Steerers BulletPoint1 : 【Size】:Adjustable length: 160mm-200mm. bottom diameter: 28.6mm, applicable handlebar diameter 25.4mm BulletPoint2 : 【Material】:Weight 380g, the whole body is made of aluminum alloy. The heavy material enhances stability and durability. BulletPoint3 : 【Surface】:The surface is sandblasted to achieve a matte finish. The all-over black is a very easy color to match. BulletPoint4 : 【Installation flexibility】:Installation is very easy. All you need is a hexagonal screwdriver and you can complete all the steps of installation and adjustment. BulletPoint5 : 【Application scope】:Universal single bikes can be mounted on the front fork. The double bicycle is mounted on the seat tube. A very good replacement for bicycle repair parts. Color : Black Department : unisex-adult DriveSystem : External Hex ExteriorFinish : Black ExternallyAssignedProductIdentifier1 : 0400310024220 ExternallyAssignedProductIdentifier2 : 400310024220 GpsrSafetyAttestation : 1 ImportDesignation : Imported ItemDisplayDimensions_Length : 12 inches ItemDisplayWeight : 1 pounds ItemName : WEERAS Extendable Stems, 160mm-200mm Riser Stem for Normal Handlebars and Tandem-Bicycles Rear Seat Handlebars ItemPackageDimensions_Height : 24.2062 centimeters ItemPackageDimensions_Length : 5.1054 centimeters ItemPackageDimensions_Width : 13.589 centimeters ItemPackageQuantity : 1 ItemTypeKeyword : bike-stems-and-parts Manufacturer : WEERAS Material : Aluminum MeasurementSystem : Metric MetalType : Stainless Steel ModelName : WRBRS-LEA02-01BK ModelNumber : 875850000308 NumberOfItems : 1 NumberOfPieces : 2 PartNumber : 121-0518 ProductDescription : Tandem-Bicycles special rear seat stem. is fixed to the front seat tube when used on Tandem-Bicycles. So it is very easy to install. This is a very good replacement part for bicycle repair. Because the length can be adjusted, you can also have a comfortable riding experience for the rear seat. Of course this stem is also suitable for ordinary bicycle forks. The length of 160mm-200mm can effectively extend the length of the whole bike specific to your use of the way to adjust.