What I’ve seen estimated based on the projectile dimensions bandied about here is a yield of 3 to 4 tons of TNT.
I did the math for a 10 foot rod .5 foot in diameter and it’s ~72 tons TNT equivalent for a perpendicular shot (which saves me having to figure and subtract the horizontal component) at 8000 FPS.
Reentry velocity is typically 17,500 mph or 25,000-26000 fps. Orbiting the delivery device counter to earth rotation would give an impact velocity double that but my orbital mechanics karate is nil. Many of the targeting situations would have to be optimized to avoid having to hump up significant quantities of fuel to decelerate for a drop.
Having some rods up there would be excellent, even if something like iron, but you couldn’t beat just having a good chunk of rock parked in a Lagrange point where you could just carve off chunks and send them on their way.