This 3" screw is used where the lead shield is buried and can't rerach it with the regular 1 and 1/2". The head is only 1/2" wide. If you want a wider head (SIDEWALK SCREW) please call it in. The wider head screw comes in a package of 50 for $21
3 Inch Storm Panel Screw
Use number 3 phillips to install and remove. You will strip the head otherwise.