The 3286 is a Pomona adaptor BNC Female to UHF Male jack.
MATERIALS :
Body and Fittings – Brass, Tarnish Resistant Plating, Center Contact
– Gold Plated Brass
– Dielectric: PTFE
RATING : Operating Voltage: Shield/Earth: 30VAC/60VDC Max.
Inner Conductor/Shield : 500VRMS Max.
Operating Temperature : -55ºC to +85ºC
Nominal Impedance : 50 Ohms