This Von Giese stem quill is a high-quality and durable part suitable for various types of BMX bikes. It comes in five different colors, including blue, purple, red, gold, and black. The stem type is threadless, and the clamp diameter is 1 1/8 inches. The stem quill is made of sturdy aluminum material, and the steerer tube diameter is also 1 1/8 inches. This stem quill is compatible with BMX bikes designed for old school, flatland, and racing. It's an essential part of your bicycle components, and it will enhance your cycling experience. Don't miss the chance to upgrade your BMX bike with this high-quality Von Giese stem quill.