The Wilwood Tactical Xtreme TX6R radial mount six-piston calipers are engineered and purpose built for severe duty service on heavy duty Trucks, SUV's, and Class 1, 2, and 3 Armored Vehicles up to 14,000 lbs. GVWR. Tactical Xtreme TX6R calipers features include: a Versatile and easily adapted radial mount design. A Stress flow forged aluminum 6-piston body design with Stainless steel pistons with high-temp internal bore seals. Developed for rotors from 14.25” to 16.00” diameter and rotor widths from 1.38” to 1.50”. Easy access top loaded type 10120,.770” thick pads with rigid .240” thick backing plates. Stainless steel bridge plates and Protected single bleed design with internal fluid ports.