ITEM NAME:Bike Quill Adapter Stem Adaptor Riser 22.2/25.4mm to 28.6mm 22.2mm+Cap Description: Qualified aluminum alloy quill stem adapter riser, sturdy, solid, high strength but lightweight Raises the height of your handlebars by increasing the height of your stem. Apply to 22.2mm to 28.6mm Front Fork Head Tube Converts mountain bicycle/ folding threadedless quill setup to threadless. Easy installing, operation and flexible Specification: Length: 130mm/5.12 inch Base Diameter(Upper diameter): 1 1/8'' (28.6mm) Steerer tube diameter:22.2mm Package Includes: 1 Piece Bike Quill Stem Adapter SKU: DMO0010170554048599.Qualified aluminum alloy quill stem adapter riser, sturdy, solid, high strength but lightweight. Converts mountain bicycle/ folding threadedless quill setup to threadless. 1 Piece Bike Quill Stem Adapter.