This items includes qty ONE screw. Shown in a grouping to display from various angles. Metric 4mm thread with .7 pitch.This type of lug mounting screw is used on thin shells, such as metal. The cup can be removed fairly easily to be used on other screws if needed. The cups washer itself is about 11.5mm in diameter (about 7/16th). About 4mm or about 5/32nd tall off the shell The center hole takes a screw about 3.5mm in diameter about 1/8 inch