The BulletProof Extreme Duty Pintle Lock is the ultimate protection for your pintle trailer. Our patented design works on all size lunette rings and provides peace of mind when leaving your pintle trailer unattended. This lock can also be purchased keyed alike to other BulletProof Locking Products. All BulletProof locks are treated with an aircraft-grade lubricant for longevity, features a heavy-duty rubber cap and comes with 2 keys.