12 Amp router motor – Combines ample power with adjustable speed settings, allowing users to glide along cutlines Adjustable speed dial (8000-25,000 RPM). 2 inch sub-base opening Fixed base has threaded holes for mounting to router table positioned in common 3-hole pattern
https://www.amazon.com/Bosch-Variable-Speed-1617EVS-4-Inch-Collets/dp/B00004TKHV