2-3/8" Round U-Bolt, 6" Length, 1/2" diameter
Part Number- UB-R201-KIT
These are rated for a 3500 lb. trailer with 2-3/8" round axle
You will receive ONE 2-3/8" Round U- Bolt with 1/2" Diameter
Also Includes TWO 1/2" fine thread locking nuts
Buy as many as you need