The C.E. Smith Slip-On Disc Brake Kit is designed for marine trailers with surge actuators or electric over hydraulic systems and is dacromet-coated for corrosion resistance. This kit is sold as a pair and includes disc brake calipers, brake pads, caliper brackets, slip-on rotors, and guide bolts. Please note a brake flange must be present to install this kit.• 12" brake size• Fits 6 x 5-1/2" bolt pattern• For use with axles rated 5, 200 lbs.• Compatible with 15"-16" wheels with 6 lugs Sold as a pair with disc brake calipers, brake pads, caliper brackets, rotors, & guide bolts 12"" brake fits 6 x 5-1/2"" bolt pattern For use with axles rated 5, 200 lbs. | CE Smith C.E. Smith Slip-On 12" Disc Brake Kit