OUR SRT-FL-20 WEAR PADS USE A LOW HEAD OR BUTTON HEAD CAP SCREW. WE HAVE STARTED TO PUT A HIGH MIRROR FINISH ON THE CARBIDE WHICH REDUCES FRICTION ON THE SURFACE SO YOU CAN ELIMINATE COATINGS. AFTER YEARS OF TRIALS AND TESTING WE HAVE OUR OWN PROPRIETARY CARBIDE BLANKS WE USE IN OUR WEAR PADS.  WE ARE AWAITING FEED BACK FROM OUR CUSTOMERS ON THE CHANGE WE HAVE MADE.