Driftless Climbing Bolts for Rock Climbing Holds-Indoor 3/8-16 Socket Cap Screw (2.5 inch)

The rate at which these rusts I'd say not just to use them indoors but avoid humidity.That being said, I was happy with the price and they work fine.

These bolts in 2.5" are not fully threaded but work great for bigger holds. Will probably not hold small or xs holds.