Specifications: Material: aluminum alloy CNC Clamp+aluminum alloy Tube& Tube Color: Black Clamp diameter:31.8mm 8 inch Tube diameter: 22.2mm,Length:202mm 4 inch Tube diameter: 22.2mm,Length:102mm Suitable for Normal Size(25.4mm) and up to Over Size(31.8mm)handlebar super longer/extended tube can assemble more items such as light/bicycle computer/phone/bell holder etc. 4 inch Extension Bar PACKAGE INCLUDES: 1× Aluminum alloy Extension Bar 1× Aluminum Alloy Bracket 1× Allen Key Wrench 8 inch Extension Bar PACKAGE INCLUDES: 1× Aluminum alloy Extension Bar 2× Aluminum Alloy Bracket 1× Allen Key Wrench