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Flex 24V Brushless Oscillating Multi-Tool Review

Flex Combines 24V Brushless Performance with a Starlock Accessory Interface

Flex may be fairly new as a power tool brand compared to other brands, but the team behind it has been making quality power tools for a long time. Their knowledge and talent is evident with the Flex 24V brushless oscillating multi-tool as it brings several impressive technologies together.


  • Fast cutting and sanding
  • Starlock accessory interface
  • Isolated head vibration control
  • Electronic speed selection
  • 5-year warranty extends to a lifetime one if you register by 12/31/21


The Basics

Flex uses a sensor-free brushless motor to oscillate accessories up to 20,000 OPM. Moving away from variable speed dials, they go with 5 electronic speed controls to select from just above the battery. One of the things we like about the placement is how easy it is to check what speed you’re in without turning the tool.

Flex 24V Oscillating Multi-Tool Controls

The oscillation rate is excellent and Flex combined it with a 4° arc that’s more aggressive than most and leads to faster cutting.

PTR Test Track

To see how fast it really is, we set up the PTR Oscillating Multi-Tool Test Track. If you haven’t seen it before, it consists of 5 real-world scenarios:

  • Door jamb undercutting
  • Drywall cutout
  • Removing trim nails
  • Removing grout
  • Sanding

Along the way, we have to make two accessory changes.

Flex 24V Oscillating Multi-Tool Cutting3

Flex finished in 1 minute, 26 seconds and that’s among the fastest multi-tools we’ve tested! Fein’s discontinued SuperCut Cordless still holds the top speed at 1:24 and DeWalt’s 20V Max brushless OMT is just behind at 1:27.

There’s some human error that comes into play with this type of test, but these three tools set themselves apart as the fastest. That’s pretty high praise for Flex considering it’s a first-generation tool!

Starlock Accessory Interface

Helping Flex stay in that top performance tier, the design team went for a Starlock interface. It’s a tool-free, hands-free system developed by Bosch and Fein. It’s much faster and more convenient than other systems. Just flip the lever to release your accessory and press the new one on until you feel and hear it click into place. Pop the lever back down and you’re ready to work!

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