New base for the 1617/1618 Series Routers * Allows adjustment of bit height from above the table – Features: Designed for router table usage * Wrench access from above table for convenient depth adjustment * Base has threaded holes for mounting to router table )positioned in Bosch 4-hole patter & common 3-hole pattern. ) Hardware included. * Wide 3-3/4 base opening allows use of larger bits * Motor housing does not rotate during depth adjustment, eliminating potential cause of horizontal movement of bit * Tool-free base change Quick clamp system allows motor to be moved w/ ease * Two additional protective devices prevent motor from falling to floor after quick-clamp is released. – Includes: Base, mounting hardware, chip shield & hex adjustment wrench w/ rubberized grip. – Specifications: Part Number: RA1165, Used on Model No. : 1617 / 1618 series routers & motors, Sales Pack Quantity: 1, Screw Head Size: 4-Hole Pattern: 4M, 3-Hole Pattern: 10-24, Category: Routers.