See image and your car manual for fittings.

• Fine Iridium tip ensures high durability and a consistently stable spark Iridium alloy has extremely high melting point, perfect for today’s high-tech, high-performance engines
• Trivalent Metal Plating - superior anti-corrosion and anti-seizing properties
• Outstanding acceleration, high fuel efficiency and durability
• Ultimate design, technology and performance.
• Iridium centre electrode (0.6mm diameter).
• Better ignition with less power needed.
• Higher performances compared to classic spark plugs.
• Taper Cut ground electrode (Better flame spread).
• 2 to 3 times more lifetime in comparison with standard plugs.
• Better stability.
• Less fuel consumption.
• Stronger accelerations / More reaction from the engine.
• Corrosion proof alloy.
• Cleaner combustion / Less unburned fuel.
• Easier cold start.
• Smooth Idle / Less vibrations.

MADE IN JAPAN

Also fits Porsches and Skodas. Please check your manual or forums for details. 

Revo recommend running NGK BKR7EIX spark plugs whether you're running Stage1 or Stage2 software for VW 1.4 TSI Twin Scroll 158bhp engines. See HERE

Product Description:

Iridium IX
Iridium Plugs are high-performance plugs with measures against plug fouling. They feature a faster spread of combustion than original plugs. They are also provided with a "thermo edge" at the top of the insulator. Designed specifically for the performance enthusiast. Iridium IX® offers extreme ignitability, improved throttle response and superior anti fouling properties.

Details

Wrench size:16,0 mm

Thread diameter:14,0 mm

Thread Length:19,0 mm

Spark gap:0,8 mm

Resistance:entstört, 5 kOhm