A cap for removably attaching to a head of a fastener includes a main body having an open end and defining a hollow interior. The cap also includes an end section forming a closed end of the main body. The cap further includes a hollow inner portion connecting to an inner surface of the end section and extending through the hollow interior toward the open end of the main body. The inner portion is spaced from the main body, and the inner portion has a distal end configured to be inserted into an opening in the head of the fastener.