I am a contractor, for 43 years. I have lots to screw to in my shower jams. the issue is I have 1/2 inch denshield then 5/8'' of an inch of marble jams. the screws provided with the door are too short to reach the 2x4s. I have stainless screws in my truck that where long enough but for many it means a trip to the hardware store to get them. my wife was not thrilled with the seals. they cheapen the look. the installation was quick and easy.