They fit perfectly on a 20" bike and are easy to assemble. Sturdy and sturdy and will not bend like other brands on the market. No additional hardware (washers) required as others have stated. A bit of mechanical common sense will help with assembly. They were bought with my son in mind. Mentally retarded, he learns to ride a bicycle. Since it has an unbalanced sense of balance, I needed training wheels that touched the ground evenly on both sides to keep the bike from rocking. Tried others with no success, but these worked exactly as intended. My son now has a little more independence and freedom. Highly recommended!
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