The OnGuard 8005 Pitbull DT U-Lock is a large, durable bike lock made of steel with a 12mm cable thickness. It features a solid construction and is rated as diamond rated for high security. The U-lock design, key mechanism, and lifetime manufacturer warranty make it a reliable choice for cycling enthusiasts looking for a secure option to protect their bike. With a sleek black colour and measuring 23cm in height and 12cm in width, this U-lock from OnGuard is a top choice for those who value both security and convenience.