Sir Tools ST0229-16 16mm 12-Point XZN Triple Square Tamper Proof Socket 1/2-Inch Drive

The Sir Tools ST0229-16 is a professional-grade 16mm XZN Triple Square tamper-proof socket designed for removing and installing security fasteners found on European vehicles. XZN (also known as Triple Square or 12-point spline) fasteners are commonly used by VAG group manufacturers — including Volkswagen, Audi, and Porsche — on transmission drain plugs, brake calipers, and other critical drivetrain components.

Key Features:

• 16mm XZN (Triple Square) bit profile — engineered to engage tamper-proof 12-point spline fasteners
• 1/2-inch square drive — compatible with standard 1/2" ratchets, breaker bars, and torque wrenches
• 12-point engagement — maximizes contact with the fastener to reduce rounding and cam-out
• Designed specifically for tamper-proof drain plug applications on European transmissions
• Professional quality construction built for automotive shop use

This socket is an essential specialty tool for servicing European vehicles that use XZN security fasteners. It pairs directly with any standard 1/2" drive ratchet or breaker bar, making transmission fluid service and other drivetrain work straightforward and precise.