It is extra difficult to be removed without keys as it attaches to the disk. Solid invincible-looking design will be helpful to anti theft Weatherproof Mechanical lock core is rigorous design so that technical opening is very difficult Color: black Outer dimension: 6 x 5 x 2.5 cm Key: 2 pcs Application: To lock disk brake of bike， electric motor car and motorcycle Package:1 x Bike Lock