Ball 2-5/16X1x2 6000Lb Cold-forged for superior strength. When installing, torque all 3/4" shank balls to 160 ft. lb., all 1" to 250 ft. lb. and all 1-1/4" to 450 ft. lb. Balls with longer shanks are designed for use with step bumpers. Engineered to meet all safety requirements of VESC regulation V-5.