The for ZTTO Bicycle BSA Thread Bottom Bracket Installation Tool is a must-have for bike enthusiasts. Made of high-strength steel, this tool is designed for precision and durability. It is compatible with BC 1.37x24 TPI bike frames and is perfect for repairing BB thread issues. Keep your bike in top condition with this reliable and efficient tool. . Tap model:BC1.37x24 The five way milling tool is divided into left and right directions, with the left being the crank direction and the right being the tooth disc direction Operation skills:Before operation, apply special tapping oil on the surface of the tap and the inner diameter of the five way joint to ensure that the tool and the five way joint are on the same horizontal wire before tapping. During the tapping process, if there is too much resistance, it should be retreated several times to achieve the goal of chip removal before tapping. Colour:As Shown Material:steel Package Contents: 1 * L end tap 1 * R end tap 2 * rotating handle Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.