Package Included:
1x Desktop Power Grommet
3-1/8"(80mm) Hole Saw with Arbor

Specification:
2 AC Outlet
3 USB Port ( 1USB-A, 2 USB-C)
Power Cord Length: 6.56 FT
Input Voltage: 12A 125V 60Hz 1500W
USB Output: up to 5V/2.1 A max each port
3 X Drill Bits
1X Allen Wrench
1 x Hex Shank Arbor
1X 80mm/3.15" Hole Saw

Attention:
Just make sure the arbor is threaded tightly before you use it.
Make sure material of the hole is fixed, and it forms a 90 degree angle with the hole opener.
The power of the hand drill must be greater than 750W, and the use of impact drills is prohibited.
Make sure the hole saw complete stop on material before pulling it away.
It is heavy, the inertia on this is a fiat amount, so when you stop, it want to keep going, which means it unscrews from the center shaft. (IT IS DANGEROURS, IF YOU DON'T FOLLOW THE RULES OF USE)
Wearing gloves on the hand supporting the cutter helps.
It is only suitable for opening plastic, wood, plasterboard, drywall, sheetrock and other materials, Not for METAL