1400 lb. Capacity Adjustable Torsion Half Axles (5-4.5" Bolt Circle) Torsion Half Axles with Flexiride Rubber Bushings that eliminate the need for trailer springs. 1400 lb Capacity Adjustable spindle 6 Mounting holes 5-hole, 4.5" bolt circle (2 3/8" center stud to center stud)