DescriptionIf you need to install a six-pin disc, but you hub is center-locked, you only need to use this conversion seat, made of aluminum alloy and stainless steel, durable and sturdy, you can tight it with an external BB wrench, easy and convenient.Features- Material:Aluminum Alloy. - Size: About5.40X5.40X1.00cm/ 2.12X2.12X0.39inch.- Exquisite process, feeling fine, easy to use. - The surface is smooth and can prevent abrasion damage. - Made of aluminum alloy material, lightweight and durable. - Fashion design, made of material, durable for long-lasting use. - If your hub is center-locked, you need to use this adapter to install a six-pin disc.