1. The integral can retain the lubricant within the bearing, the dust proof and waterproof effect is good, extending the service life, suitable for bad environments.
2. Outer bowl is made of aluminum alloy material with T6 heat treatment and CNC machining, light weight with high strength.
3. Built in deep gutter ball bearing and metal bearings, high speed, efficient operation with little noise; insert the fork accurately, bearing can rotate smoothly for 360°.
4. Rubber waterproof circle with high quality rubber can add a layer of waterproof protection in bowl cover, anti , waterproof and sediment proof,having a longer service life.
5. Universal type for straight and tapered fork, suitable for standard tapered tube front fork for upper outer diameter 28.6mm/1.12in, lower outer diameter 39.8mm/1.6in, standard straight tube front fork for upper outer diameter 28.6mm/1.12in, lower outer diameter 30mm/1.18in.

Specification:
Item Type: Bike Double Bearing Headset
Material: Aluminium Alloy
Application: For Frame Head Tube: The Inner Diameter Of Upper Tube Is 44mm/1.7in and Inner Diameter Of The Lower Tube Is 55mm/2.2in.
For Front Fork: Standard Tapered Tube Front Fork Upper Outer Diameter 28.6mm/1.12in, Lower Outer Diameter 39.8mm/1.6in, Standard Straight Tube Front Fork Upper Outer Diameter 28.6mm/1.12in, Lower Outer Diameter 30mm/1.18in
Weight: Approx.141g/4.97oz
Specification: 44-55mm/1.7-2.2in (Universal Type for Straight and Tapered Fork)

How to Use:
Product description (from bottom to top, the bowl sets are respectively installed on the upper and lower ends of head tube) : bottom gear( switchable between 30mm/1.18in and 39.8mm/1.6in), lower bearing, lower bowl set, upper bowl set, upper bearing, pressing , bowl set cover, sunflower shape top cover kit.

PackageList:
1 x Sunflower Shape Top Cover Kit
1 x Headset Cover
1 x Pressing
1 x Upper Bearing
1 x Upper Bowl Set
1 x Lower Bowl