Feature Highlights: 1. Complete Kit: Includes 2 shoulder bolts, 2 drive wheels, 2 vertical supports, 2 washers, 2 lock nuts, and 2 limiting spacers—everything you need for easy installation. 2. Premium Build: Made from high‑quality metal, durable plastic, and slip‑resistant rubber for long‑lasting use. 3. Safety‑First Design: Extra‑stable stand helps young riders build confidence and balance while learning to ride, so you can feel at ease about your child’s safety. 4. Sturdy Support Wheels: Features non‑slip, wear‑resistant wheels with 3.0 mm thick supports for added stability and security—perfect for beginners. Matches any bike color. 5. Universal Fit: Adjustable training wheels fit most 12″/14″/16″/18″/20″ single‑speed bikes with standard rear‑facing horizontal fork ends. (Note: Not compatible with semi‑horizontal or vertical fork designs.) Product Details: These universal bike stabilizer training wheels give beginners the balance and confidence they need to learn cycling safely. Built from tough metal, plastic, and rubber, they offer a sturdy, slip‑resistant support system. The adjustable design fits a wide range of children’s bicycles, and the simple kit includes all necessary hardware for quick, tool‑free installation. Specifications: - Contents: 2 shoulder bolts, 2 drive wheels, 2 vertical supports, 2 washers, 2 lock nuts, 2 limiting spacers - Wheel thickness: 3.0 mm - Compatible bike sizes: 12″ / 14″ / 16″ / 18″ / 20″ single‑speed bikes (with standard rear‑facing horizontal fork ends) - Color: Black