PROFLEX 50 lb Gray Powder Medium Bed Mortar Decorative Stone Impact Resistant Impact Resistant GRKs R4 Multi Purpose Framing Screw has 6 self contained cutting pockets which act like a router and transport the drill dust away from the edge of the screw hole Use Over Exterior Grade Plywood Yes Use Over Concrete Yes Warranty 1 year Series Name N A Unit of Measure Pound(s) Unit of Measure Quantity 50 Rapid Setting No Color Finish Family Gray Freeze Resistant Post Installation Yes Product Type Powder For Use with Garage Walls No UNSPSC 30111500 For Use with Shower Walls Yes For Use with Vinyl Floors No For Use with Garage Floors Yes For Use with Bathroom Walls Yes CA Residents: Prop 65 Warning(s) Yes Use Over Cement Backer Board Yes For Use with Kitchen Counters Yes Use Location Outdoor For Use with Shower Floors Yes Type Medium bed For Use with Bathroom Floors Yes Required Additional Components Water For Use with Pools No For Use with Patios Yes For Use with Fireplace Exteriors No For Use with Kitchen Backsplashes No Professional grade thick bed mortar mix for installation of large format tiles Flattens concrete or wood substrates up to 4 in with no additional reinforcement Ideal for creating slopes in showers or ramps Mixes with water Rated extra heavy duty for use in commercial kitchens Freeze resistant