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This Drill Bushing Cup/Egg Cup is machined from 6061-T6 Aluminum. Its center hole has been machined to accommodate a 0.500″ drill bushing (sold separately) which we produce individually or as part of a set of drill bushings. The drill cup is used as an aid to more accurately drill out a fastener or the initiation of a drilled hole in a flat or curved surface. The Drill Egg Cup has been treated with Alodine to give it the amber colored finish, and to maintain a cleaner/harder surface finish than bare aluminum. This drill cup is far more durable than similar cups made of plastic. A recent improvement to the design, is the addition of a 10-24 Helicoil Inset and the 10-24 TPI Set Screw. The set screw is equipped with a “half dog” which mates with the receptacle in the drill bushing and locks it in place.