Push the dint ball bearings is to separate a bearings, can bear the path only to carry the lotus.The one-way bearings can bear a stalk of direction only to carry the lotus, the double can bear change of two directionses stalk toward bearings to carry the lotus, push the dint ball bearingsand must take into the stalk in the work to to tight.They mainly be applicable to a heart, automobile clutch of lather and decelerate machine etc..Double to push the dint to hand over to get in touch with the ball bearings to be applicable to the tool machine principal axis, one-way push the dint to hand over to get in touch with the ball bearings to be applicable to the silk to pay to accept.