PTI 115mm Mortar Raking Diamond Disc 7mm Segments For raking out old mortar prior to re-pointing. Gulleys between segments provide cooler running and remove waste, thus minimising downtime. 115mm /4.5" diameter disc 6mm thick diamond impregnated segments 22.2mm bore to fit most 115mm angle grinders Impregnated with diamonds Suitable for wet or dry cutting Can outlast over 200 abrasive discs Not suitable for cutting or grinding metal