24-inch machined winding bars, 5/8 to 1/2 inch, model 576. Longer bars mean more leverage, which you'll appreciate on heavier springs. The machined taper gives you a snug fit in the winding cone, reducing that sketchy play you get with hardware-store rod. At 24 inches, these are a good middle ground between reach and handling. The 5/8 to 1/2 inch size fits larger winding cones typically found on heavier residential and commercial springs. If you're a tech who works on garage doors daily, these are worth having on the truck. Confirm the bar size matches your winding cones.