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Nominal Size:
#8-40 x 1/2"
Head Diameter: 0.2355"
Head Height: 0.1025"
Threaded Length: 0.4915"
Overall Length: 0.5940"
Material: Hardened Steel
Finish: Black Oxide
Head Style: Weaver Oval (T-10 Star Bit)
Thread Size: 40 (Fine)
Thread Length: Full
Type: Machine Screw

Bag of 10.

Firearm and Scope screws by type: