[Material]: This ball bearing retainer made of steel, high quality, durable and high intensity. [Dimensions and specifications]:Inner Cage Dia: 0.74 inch, Ball Dia: 1/4 inch. Please confirm whether this size is suitable for your bicycle before you buy them. [Application:]: This kind of ball bearing stainless steel ball inlaid in the retainer design,It is a bicycle parts, it's suitable for replacing the crank bearing of the bicycle. [Widely usage]: This beads rack for bike parts replacement, suitable for ordinary bicycles, mountain bikes, kids bicycle, lowrider bikes, stretch bicycles. Description Pair Bicycle Rear Wheel Axle 1/4Inch x 9 Ball Bearing Cages MTB Bike Cycle Features: 2x Bicycle Rear Wheel Axle 1/4Inch x 9 Ball Bearing This ball bearing retainer with 9 balls, which suitable for 19mm inner diameter head parts.It is an ideal replacement for you bike. 9 x Ball Bearing cages 1/4" Bearings for Bike's Rear wheel / Axle Specifications: Bearing Model: 1/4" x 9 Bearing Size: 1/4" Material: Steel Colour: Silver Size: 1/4"x 9 (Approx Outer Cage Dia - 28mm) (Approx Inner Cage Dia- 19mm) For Component: Hub/Wheel Type:Retainer Bearing Component Sub-Type: Bearing For Bike Type:Mountain Bike Package Included: 2 x Rear Wheel Axle 1/4Inch x 9 Ball Note 1.Due to lighting effects, monitor's brightness , contrast settings etc, there could be some slight differences in the color tone of the pictures and the actual item. 2.Please allow 1-2mm differs due to manual measurement, thanks.