Thank you for viewing. This is a GORIN GR-523 button ring lock for V-brakes. I purchased this on this site three days ago, but upon trying to install it, I found that the size doesn't fit, so I am putting it up for sale. I did take the product out of its packaging, but I only tried to fit it to my bicycle and did not use it. The product packaging has been neatly restored to its original condition. However, please understand this. - Brand: GORIN - Model: GR-523 - Type: Ring Lock - Compatibility: For V-brakes - Instruction Manual: Included ■■Notes■■ We do not accept claims, returns, or after-sales support. The minimum product specifications are listed, but please research the details from the model number. Please refrain from purchasing if you are concerned about minor details.