The Dura Type insert pad was originally developed as an aftermarket upgrade for high end Shimano brake systems. Kool Stop's Dura pads are the same spec as Shimano pads and fit Shimano, Sram, TRP and Tektro holders with a set screw.
Shimano, SRAM, Tektro, TRP
Brake Lining Material
Cartridge Road System (Shimano Ultegra, Dura Ace and 105 road brakes)