1. strength aluminum alloy steel: The bicycle bearing pressure sleeves are made of aluminum alloy and 304 stainless steel, providing rustproof, strength and durable performance. The aluminum alloy joints are subjected to CNC precision turning, surface anodization and fine threading. The stainless steel screw rod has a total length of about 24.5 cm, a diameter of about 12 mm, and features tight, fine threading for strength, making it suitable for most head tube thicknesses. 2. Laborsaving design: The tight, fine pitch and strength make it compatible with most head tube lengths. Equipped with flat thrust bearings and lubricated ball bearings, it ensures even pressure distribution, effortless operation, resistance to bending, and broad applicability with strong versatility. 3. Pressure block design: The bicycle bearing pressure sleeve has a pressure block design, with the backside for pressin bearing installation. The recessed platform design prevents bearing pressure during installation. The lubricated ball bearings enable smooth, laborsaving operation and are resistant to crushing. 4. Package Content1 x Installation Tool Dimensions (width x height): approx. 245 mm x 260 mm