Customers most agreed on the following attributes:
I bought a Sigma 10-20 lens. When I bought the lens, everyone told me to replace the rear cap. After using the lens, they were right. The Nikon rear cap works properly. The Sigma is sometimes a challenge.
Nothing like OEM equipment to work right. Much better than the slip-on caps which do not lock in place.
This is the exact same cap as the broken one it replaces.