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OnGuard says its RockSolid is the lightest angle grinder-resistant lock

Published March 10, 2025

SHARON, Mass. (BRAIN) — OnGuard says its RockSolid u-lock is the world's lightest angle grinder-resistant lock.

The lock features a proprietary coating that is a blend of ceramic and diamond and resists cutting, as shown in a YouTube video where it turns a blade to dust after 25 seconds.

The lock boasts a Diamond Sold Secure rating. Cycling Weekly recently awarded the RockSolid best in class when it tested five angle grinder resistant locks.

OnGuard says the RockSolid also offers a seamless user experience. "Its ergonomic design ensures easy handling, and is the lightest angle grinder -esistant lock in the market at 3.1 pounds.

The lock includes up to $5,001 of bicycle insurance. MSRP: $249.95. More information at onguardlock.com/category/u-locks/.