Features1Front quick release lever is 130mm / 5.1in and the rear quick release lever 170mm / 6.7in (diameter 5mm / 0.2in) is easy to use and can help quickly remove the bicycle wheel. 2Front seal bearing has 2 sealed bearings, the rear seal bearing has 4 sealed bearings, 32 strip holes, 6 claws, 108 rings (Applicable for XD&HG 811 speed tower base). 3Shell is made of highquality chrome steel material and aluminum alloy 7075, which is durable. 4Easy to use, without any professional requirements even though you are an amateur. 5Fine craftsmanship and strict manufacturing techniques make it more durable.SpecificationItem Type: Bike Hub BearingMaterial: Aluminum Alloy 7075 (Shell) + Chrome Steel (Shaft)Quick Release Lever Size:Front Lever Length: Approx. 130mm / 5.1inRear Lever Length: Approx. 170mm / 6.7inDiameter: Approx. 5mm / 0.2inWeight: Approx. 727g / 25.6ozStrip Hole: 32 HolesFreewheel Body: 6 Claws and 108Ring(Applicable forXD&HG 8-11 Speed Freewheel Body)Regulation: 14GFrontSealBearing: 2RearSealBearing: 4Package List2 x Hub2 x QuickReleaseLever