#2 square-drive bugle heads drive flush with work surface

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1/2-13 x 4 1/2 Socket Set Screw Cup Point Alloy Phillips Bugle Hi-Low Drywall Screws Black Phosphate #2 square-drive bugle heads drive1 2 13 x 4 1 2 Socket Set Screw Cup Point Alloy . A headless screw threaded the entire length. It has a hexagonal drive at one end and a cup shaped indentation at the other end. The cup point is the most used style set screw. Designed for fast, permanent and semi permanent location of parts on shafts with hardness differential of 10 15 Rockwell C points and where cutting in of cup edge on the shaft is acceptable. Hardness: Rockwell C45 53.