Made from grade 8 threaded rod. Each U-Bolt comes with 2 high nuts and 2 heavy washers. Pricing is based per U-Bolt.
All U-Bolt lengths are rounded up to the nearest stock length. Example: a 12" U-Bolt could be a half inch longer in some cases, this depends on the ID of the U-Bolt.

How to Measure a U-Bolt

Regardless of the bend type, all Leaf Spring U-bolts are measured in the same manner as shown here. The U-bolt size is given as 

(A) Gauge
(B) ID   
(C) Length