Description: 7, 8, 9, 10, 11,12 mm, and check valve. The 6 different wrench sizes seal to the bleeder valve, easy to loosen and tighten with built-in wrench and socket. Without breaking the seal. Ideal for bleeding brake and hydraulic clutch system. With 1.2M (47 inch)silicon hose with check valve for safety operating. Easy to use without removing wheels or raising the cars. For universal nipples. .