Suitable for frame, head tube, upper and lower inner diameters 34 mm. The upper tube of the front fork outer diameter is a 28.6 mm straight tube front fork. Brand: Gineyea. Title: GH-608 bearing wrist group. Size: 28.6 * 34 * 30. Material: aluminum alloy CNC processing. Surface treatment: anode. Rotation shaft: Perlin bearings. Color: black, red. Weight: about 117g (excluding box). Accessories: Sunflower block group. 30MM inner diameter bottom. Package: 1PCS Bowl group.