Dust Extraction Cutting GuardDust Removal System for Mortar Masonry Brick Raking, Wall ChasingExpert Professional Dust Control For 115mm/4.5" and 125mm/5" Angle GrindersThis MY TOOL EXPERT cutting guard has been designed for dust removal for cutting or mortar joint removal. When used with an appropriate angle grinder, diamond disc, and dust extractor vacuum unit it can remove up to 99% of static and air-borne dust.Perfect power tool accessory for all repointing, mortar raking and chasing applicationsThis guard has been designed for dust removal while cutting or mortar joints removal.When used with an appropriate angle grinder, diamond disc, and dust extractor vacuum unit it can remove up to 99% of static and air-borne dust.Makes wall chasin.