HMI cover kits and prop arms are designed to enhance electrical enclosures. The HMI cover kits provide protection for instruments or electronics requiring routine attention or detail. The prop arm is made of stainless steel and has a silicone rubber cap, allowing users to hold the cover in an open position when it is installed with the hinge at the top. This allows the use of both hands to perform maintenance or other work necessary inside the enclosure without having the HMI cover kit to close. The cover kits are available in six sizes, and each has a corresponding prop arm.