Bosch 1613AEVSK 2-1/4-Horsepower Electronic Plunge Router Kit Microfine bit depth adjustment can be made after setting plunge position. Variable speed, soft-start, constant response circuitry maintains desired rpm. 3-5/16" base opening with 2" subbase opening for large bits and visibility. Exclusive precision centering design for centering optional templet guides. Dust hood, 1/2" & 1/4" self-releasing collets, and comfortable drop-forged wrench