A fixed base holds the bit at a set depth and suits edge profiles, grooves and router-table work, while a plunge base lets you lower the spinning bit into the middle of a workpiece for mortises and stopped grooves. This Bosch kit includes both bases on a single 12 amp motor, so one tool covers the jobs a hobbyist or small shop most often needs. Constant response circuitry stabilizes startup torque and holds speed under load, so the bit does not bog when it meets dense wood.
The variable speed dial from 8,000 to 25,000 RPM matters because large bits must turn slowly. A 2 inch panel-raising bit at full speed can be dangerous, while a small straight bit at low speed burns the wood. Compared with the Bosch 1617EVS, the kit adds the plunge base for a small step up in relative tier. Compared with the trim routers in this guide, it is far stronger but too heavy for one-handed laminate work.
Ownership: use bit shanks with the full 1/2 inch collet when possible, since 1/4 inch shanks flex and chatter in a 2.25 HP machine. Clean pitch from bits, because built-up resin burns the wood. Clean the collet regularly and replace it if a bit slips. Brushes are replaceable on this class of motor.
What works
- Fixed and plunge bases in one kit cover most jobs
- Constant response circuitry holds speed under load
- 8,000 to 25,000 RPM suits large and small bits
- Threaded base pattern fits common router tables
Watch out for
- Heavier than trim routers for one-handed work
- Kit costs more than the fixed-base model
- 1/2 inch collet bits cost more than 1/4 inch bits
Spec sheet
- Motor
- 12 amp, 2.25 HP
- Speed
- 8,000 to 25,000 RPM variable
- Bases
- Fixed and plunge
- Circuitry
- Constant response
- Use
- Edges, grooves, mortises, router tables





