Description: - Front Hub Adapter: The front 15mm boost hub adpater allows 100mmx15mm front hub convert into 110mmx15mm. - Rear Hub Adapter: The rear 12mm boost hub adpater allows 142mmx12mm front hub convert into 148mmx12mm. - Material: Made of aluminium alloy material, which is high strength, anti rust, non deformation and durable.Package Includes: This set includes 1 piece hub conversion adapter, 2pcs spacer and 6pcs bolts.Easy to Use: Comes with necessary accessories, easy to install and convenient to use.Specification:Item Type: Hub Conversion AdapterMaterial: Aluminium AlloySize Chart:Hub Conversion Adapter Size:3mm: About 44x3mm/1.73x0.12inch5mm: About 44x5mm/1.73x0.2inchSpacer Size(Outer Dia. x H):3mm: About 18.9x3mm/0.74x0.12inch5mm: About 21x5mm/0.83x0.2inchBolts Size(Dia. x H): .9x17.4mm/0.39x0.69inchPackage Includes:1 Piece Hub Conversion Adapter2 Pieces Spacer6 Pieces BoltsNote:1. Please allow slightly error due to manual measurement.2. Due to the difference between different monitors, the picture may not reflect the actual color of the item.3. Wish you a wonderful on-line shopping!