My factory 2012 LT springs were too strong for standard 10" "heavy duty" spring compressors. The bolts were bent and I was afraid they would break and hurt me. They are a bit pricey but worth it for large car springs. They turned with ease and did it quickly. Must be just to be safe. No 5 stars due to poor handling and packaging. The male thread that holds the bottom bracket to one of the bars was so difficult to turn that I had to clamp it in a vise and use the PB Blaster to wiggle it back and forth until it moved by hand. One of the two bottom brackets was also reversed upon arrival. Both looked in the same direction.