1/4-15 x 1 Phillips Pan High Low Screw Fully Threaded Black Zinc and Bake AST and the 4 1/2 refers

and the 4 1/2 refers to the length of the bolt

while the 6-lobe drive helps to prevent cam-out

and are available in a variety of lengths and head styles to meet your specific needs

* Lubricated

1/4-15 x 1 Phillips Pan High Low Screw Fully Threaded Black Zinc and Bake AST and the 4 1/2 refers1 4 15 x 1 Phillips Pan High Low Screw Fully Threaded Black Zinc and Bake This screw is made of steel and has a black zinc and bake finish. It has a pan head with a Phillips drive and is fully threaded. The screw is 1 inch long and has a diameter of 1 4 inch. It is designed for use in a variety of applications, including woodworking, metalworking, and plasticworking.