The Whirlygig Radial Arm Trimmer (RAT) was designed specifically to pair with the Riser Form and enables for seamless installation resulting in a size accurate finished product that matches the adjacent road surface without the need for shimming or other adjustments.
The Whirlygig RAT utilizes a pneumatic Die Grinder to do the trimming. It requires an air compressor rated at 90psi with a 20-gallon air tank minimum. Air compressor is not included with the Whirlygig RAT.