- Brand: ZagoSystem of Measurement: Unified (inch)Mil-Spec: NoHead Type: Flat 82°O-Ring Material: Silicone RubberThread Size: 8-32Length: 1/2"Material: Stainless SteelFinish: PlainLocking Element: NoneDrive Size: 3/32"Drive Type: HexThread Fit: Class 2AThread Type: UNC