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Here's what other sites are saying:
Protect your ice screws from abrasion while you're en route to your route with the Black Hole 5-Pack from Grivel. These small, tough caps protect the tip but are pierced to provide drainage and prevent rust. Caps can be attached to the screw handle.
- Mountain Gear
Grivel Black Hole 5-Pack The Black Hole by Grivel features good protection for the sharp and delicate tips of ice screws during transport. New design that fits various diameters of screws. The bottom of each cap is pierced to release any water and dampness that could cause rust, a problem with the old caps. Whilst using the screws the protection can be hooked onto the screws handle where it doesn't risk being lost. This is a solution to two problems: rust on the blades of screws and losing the caps whilst out.