Nikwa Black 90 Degree Door closer is highly recnommend for HDB Main Door to prevent your hdb door from slamming to the wall at the back of the door

This door closer allows you to adjust the swing speed and ledge speed when closing the door

Also it is a must to install a door closer to prevent digital lock from damge through heavy door slam

Without the door closer, warranty will be void for Yale Gateman, Keywe, EPIC, Mazi and Samsung Digtal lock