The Relton HST-20 is a 1-1/4" brazed-carbide hole saw engineered for precision drilling through ceramic tile, marble, granite, Corian, and fiberglass in wet applications including tubs, spas, and shower installations. This professional-grade bit features a carbide-tipped pilot and delivers a standard 2" drilling depth for clean, accurate cuts in the hardest materials.
SPECIFICATIONS
Relton HST-20 Core Specs
Diameter
1-1/4"
Standard bore size
Drilling Depth
2"
Standard cut depth
Cutting Edge
Brazed Carbide
Industrial grade
Pilot Type
Carbide Tipped
Included with bit
Model Number
HST-20
Relton OEM
Application
Wet Drilling
Tile, tub, spa use
TECHNICAL DETAILS
What's Included & Material Compatibility
| Package Contents | Hole saw cutter-head, shank, carbide-tipped pilot |
| Ceramic Tile | Compatible – standard tile installations |
| Natural Stone | Cuts marble and granite surfaces |
| Solid Surface | Corian and similar composite materials |
| Fiberglass & Gelcoat | Tubs, spas, shower pans, marine applications |
| Recommended Use | Wet drilling with constant water flow |
| Typical Applications | Faucet holes, shower valve penetrations, spa jet openings |
COMPATIBILITY & APPLICATIONS
Where This Bit Excels
The Relton HST-20 is built for plumbers, tile installers, and contractors who need reliable performance drilling through hard, brittle materials in bathroom and spa environments. The 1-1/4" diameter is ideal for standard valve penetrations, small faucet installations, and spa jet fittings. Brazed-carbide construction means the cutting edge stays sharp through repeated use in abrasive materials like granite and ceramic. Always use water as a lubricant and coolant during drilling to extend bit life and prevent material cracking. Compatible with standard drill chucks and right-angle drills rated for masonry bits.
💧 Run a steady stream of water over the cutting area during use. This keeps the carbide cool, clears debris from the cut, and dramatically reduces the risk of cracking tile or gelcoat.
