Superior Diamond Mortar Disc 115mm/4.5" Mortar Masonry Joint Raking Blade for All Angle Grinders Mortar Raking Blade has been designed with the professional user in mind, the disc has unrivaled performance in the hardest of mortars and gives an exceptional lifespan with 7mm segments and a high diamond to compound ratio. Diamond Mortar Disc 115mm/4.5"; Diamond Height 7mm; Raking Width 6mm; Bore Size 22.23mm; 7mm high segment offers 15-30% more diamond than most diamond mortar raking blades · Easy to use, offering massive savings in time, effort and costs · Vibration minimised to safeguard the operator and machine · &nbs.