ITEM NAME:Practical Bicycle Bike Crank Extractor Bottom Bracket Remover Repair Tool #JT1 Product Description Description: Features: A necessary tool for outdoor biking Practical and easy to use Specifications: Material: Steel Color: Black Crank: Size: Approx. 7.7cm x 2cm Hexagon Socket Sleeve Internal Diameter: Approx. 1.4cm Black Nut Screw Thread Diameter: Approx. 2.1cm Bottom Bracket: Size: Approx. 5cm x 3.1cm Splinted Bottom Bracket Round Hole Internal Diameter: Approx. 2.3cm Square Hole: Approx. 1.3cm * 1.3cm Included: Package Content: 1 x Crank 1 x Bottom Bracket.Bottom Bracket Practical and easy to use. 1 x Bottom Bracket. Square Hole: Approx. 1.3cm 1.3cm. A necessary tool for outdoor biking. If item is defective after 3 months, you can still send it back to us.