Features: Brand new and hight quality. Made of hardened steel Comes with 3 socket, M10 M12 ,M14 Installation method: First smear a thin layer of high temperature resistant butter on the bearing seat of the box body, and then knock the bearing into the box body along the outer ring. Remember not to knock to the middle. After the bearing is knocked to the end, a thick sound will be emitted. It's already in place. At this time, put a thin layer of butter on the inner ring of the bearing, insert the crankshaft into the bearing, and use a tool to tighten the nut from the other end while pulling it. When the crankshaft is about to be pulled into place, you should not use too much force. Then apply sealant on the box and pull the crankshaft into the other half of the box. After installation, the crankshaft is not in the middle of the box, and it rotates very tightly or does not rotate at all. At this time, you can use tools such as the naked eye or feeler gauge to determine which direction the crankshaft is offset, and then use this set of box tools to straighten the crankshaft. Pay attention to the grasp of the strength, not too hard to prevent the bearing clearance from being enlarged. After the rotation is smooth, the installation is complete and the oil seal can be applied. Each is equipped with M10, M12, M14, 3 heads. Suitable for most models