Tips: Due to different monitors, shooting light, environmental factors and other reasons, there are some color differences that exist objectively and cannot be avoided. But usually does not affect the use of the product, if you mind these, please consider carefully before buying. thank you! Features: The Length of moderate price these Screws are 15mm, workmanship Thread length is 8mm and recommended Head Diameter is 11mm.The Screws can either by taken off and put on my hand using the thumb grip or you can use the appropriate screwdriver.These quality crafted thumb screws provide quick installation for securing cases and can easily be tightened by hand without much force.These thumb screws are an perfect replacement for the outer case screws. This makes it a lot easier to remove the sides without the need for a screwdriver.