Diamond Hole Saw Size Guide
Pick the hole size first, then the series that suits your material. Sizes are the nominal diameter of the hole the saw cuts.
How to choose a size
- Measure the outside diameter of what has to pass through the hole – the pipe, the faucet shank, the fitting – not its nominal pipe size.
- Check the fixture's instructions: faucets, dispensers and air switches usually state the hole size they need.
- When in doubt, go one size up for clearance. A hole cannot be made smaller.
- For holes under 1", see small diamond drill bits. For 1–3mm holes, see the sea glass bit size guide.
Common uses by size
| Hole size | Typical jobs |
|---|---|
| 1" | Small conduit and 1/2" pipe or PEX pass-throughs, towel bars and shower door hardware, soap dispensers, planter drainage |
| 1-1/4" | Faucet and soap dispenser holes, RO faucets and air gaps, grab bar anchors, 3/4" supply lines |
| 1-3/8" | Standard kitchen faucet holes, soap dispensers, sprayers, disposal air switches; 1" pipe sleeves through masonry |
| 1-1/2" | Faucet, sink and water filter holes, widening a sink opening for a new faucet, 1" pipe pass-throughs |
| 1-3/4" | Shower valves and sink fixtures, air gap fittings, pipe up to 1-1/4" |
| 2" | Pipe up to 1-1/2", shower fixture openings, 1-1/2" conduit through brick and block |
| 2-1/2" | 2" pipe and conduit, mini-split line sets |
| 3" | Sink and shower drain lines, vessel sink drains, recessed lighting, mini-split line sets |
| 4" | 3" duct, dryer and bathroom fan vents, 3" PVC drain pipe, shower valve trim |
Every size and series
A ✓ links to that hole saw. Size links open the page with every series in that size.
| Size | Metric | Chrome | Chrome + pilot | Cobalt | Pro | Masonry (Gold) |
|---|---|---|---|---|---|---|
| 1/4" | 6 mm | ✓ | – | – | – | – |
| 5/16" | 8 mm | ✓ | – | – | – | – |
| 3/8" | 10 mm | ✓ | – | – | – | – |
| 1/2" | 13 mm | ✓ | – | – | – | – |
| 5/8" | 16 mm | ✓ | – | – | – | – |
| 3/4" | 19 mm | ✓ | – | – | – | – |
| 7/8" | 22 mm | ✓ | – | – | – | – |
| 1" | 25 mm | ✓ | ✓ | ✓ | ✓ | ✓ |
| 1-3/16" | 30 mm | ✓ | – | – | – | – |
| 1-1/4" | 32 mm | ✓ | ✓ | ✓ | ✓ | ✓ |
| 1-3/8" | 35 mm | ✓ | ✓ | ✓ | ✓ | ✓ |
| 1-1/2" | 38 mm | ✓ | ✓ | ✓ | ✓ | ✓ |
| 1-5/8" | 41 mm | ✓ | – | – | – | – |
| 1-3/4" | 44 mm | ✓ | ✓ | ✓ | ✓ | ✓ |
| 2" | 51 mm | ✓ | ✓ | ✓ | ✓ | ✓ |
| 2-3/8" | 60 mm | ✓ | – | – | – | ✓ |
| 2-1/2" | 64 mm | ✓ | ✓ | ✓ | ✓ | ✓ |
| 2-3/4" | 70 mm | ✓ | – | – | – | ✓ |
| 2-7/8" | 73 mm | ✓ | – | – | – | – |
| 3" | 76 mm | ✓ | ✓ | ✓ | ✓ | ✓ |
| 3-1/8" | 79 mm | ✓ | – | – | – | ✓ |
| 3-3/8" | 86 mm | ✓ | – | – | – | – |
| 3-1/2" | 89 mm | ✓ | – | – | – | ✓ |
| 3-3/4" | 95 mm | ✓ | – | – | – | – |
| 4" | 102 mm | ✓ | ✓ | ✓ | ✓ | ✓ |
| 4-1/8" | 105 mm | ✓ | – | – | – | – |
| 4-1/4" | 108 mm | ✓ | – | – | – | – |
| 4-3/8" | 111 mm | ✓ | – | – | – | – |
| 4-1/2" | 114 mm | ✓ | ✓ | – | – | ✓ |
| 4-3/4" | 121 mm | ✓ | – | – | – | – |
| 4-7/8" | 124 mm | ✓ | – | – | – | – |
| 5" | 127 mm | ✓ | – | – | – | – |
| 5-1/8" | 130 mm | ✓ | – | – | – | – |
| 5-1/2" | 140 mm | ✓ | – | – | – | – |
| 5-7/8" | 149 mm | ✓ | – | – | – | – |
| 6" | 152 mm | ✓ | – | – | – | – |
| 6-5/16" | 160 mm | ✓ | – | – | – | – |
| 6-5/8" | 168 mm | ✓ | – | – | – | – |
| 7" | 178 mm | ✓ | – | – | – | – |
| 7-1/2" | 190 mm | ✓ | – | – | – | – |
| 8" | 203 mm | ✓ | – | – | – | – |
Notes
- Depth of cut: Chrome 1-1/8" (most sizes), Chrome with Pilot, Cobalt and Pro 1-3/8", Masonry (Gold) 2".
- Chrome 7-1/2" and 8" can cut a hole up to 1/8" smaller than the nominal size.
- Chrome 3", 4" and 4-1/2" kits and Masonry 3", 4" and 4-1/2" include a drill guide.
- Not sure which series? See the series comparison.