With the Spax Spax-RA frame anchor, you install timber and pvc window and door frames quickly and stress-free directly into masonry or concrete without using wall plugs. Thanks to the full thread, you achieve precise distance mounting while preventing frames from distorting or warping during fastening. The t-star plus T30 drive ensures optimum power transmission and prevents bit slippage. Its compact cylindrical head countersinks discreetly into the profile for a neat, clean finish. In addition, the Wirox coating reliably protects the steel from corrosion during indoor and covered outdoor projects.