First thing after getting my Sunlu S4 dryer that I noticed was opening the lid was a pain. These handles utilize the PTFE openings on the top. The PTFE couplers in the lid will grab onto M4 screws and hold. I used M4 x 16mm.

On each end of the handles are little slots to allow you to use a small screwdriver to depress the PTFE coupler to remove the handle.

Also has spots on the top for 6x2mm magnets to let the lids stick to each other. Works alright but probably not really all that helpful.