The axle extension stabilizer provides extra support and balance, ensuring that children can ride safely and comfortably. They are also made from good materials, ensuring that they are durable and long-lasting. Installing the axle extenderstabilizer is quick and easy, making them a great choice for parents who want to help their children learn to ride a bike. Features -Color:Black -Material:Iron -Size:13.50X4.00X3.10cm/5.31X1.57X1.22in -Note:Suitable for size of 12/14/16/18/20inch wheels. - This shaft extender allows you to install a training wheel onto your bike with short rear axle. - Made with sturdy iron material, wear-resistant, rust-proof, can keep the gear on your bike. - A good substitute training wheel extender for your broken or worn out one. - Easy to install and simple to use, not easy to rust and deform, high strength, excellent and durable. - Sturdy material and excellent craftsmanship ensure their popularity among the people. Packing list1 x Pair of Children Bike Axle Extenders