For A 1-1/8" Threadless Size Converter, Zukka Bike Stem Quill Adapter, Bicycle Product Details The stem riser is suitable for most bicycles with 1-1/8 inch (28.6 mm) threadless steering gear. Total length: 180mm/7.09inch, bottom diameter (upper diameter): 1 1/8Inch (28.6mm), steering tube diameter: 25.4mm/1 inch. Aluminum alloy material and polished anodized finish are strong and durable. Raises the height of bike handlebars by increasing the stem height. Easy to install .just put the extender into the fork steerer tube, tighten the top bolt, and then connect up the stem. Payment We accept PayPal and credit cards via PayPal. Taxes - US We collect sales tax, as required by law. Shipping We make every effort of shipping within 3 business day of payment clearing. The estimated delivery time is 2 - 5 business days from the shipping date. Policies If you do need to return your item, please contact us via email (you will receive an email when your product ships with additional details - Subject: Important information about your purchase). You will then be provided with a return shipping label and packing slip. Pack the item carefully. Include the packing slip, apply the shipping label, and return the item within 30 business days of the date you request a return, or your return will be canceled. Once we receive your order we will inspect the return. Please allow up to 5 business days of receiving the returned item for your refund.