Drill America 5 Piece Tungsten Carbide 1 4 in Cutting Bit Accessory Outdoor Fence Posts Heavy duty upper wheel support and Heavy duty upper wheel support and tracking mechanism for smooth operation ) 18 Spout Height (in stainless steel and metals Double cut style for rapid material removal in tough applications Solid carbide tooling provide long life and faster cutting speeds Round 1 4 in Sub Brand Drill America CA Residents: Prop 65 Warning(s) Yes For Use on Glass No For Use on Wood Yes Warranty None For Use on Ceramic No Total Number of Pieces 5 For Use on Concrete No For Use on Grout No Material Tungsten carbide Set Individual Individual For Use on Metal Yes Diameter Measurement 1 4 in For Use on Drywall No Type Bur For Use on Plastic Yes Application Cutting