Cleco 100000100 RB 156 Microstop Cage, Offset Mounting Base Product Image May Not Reflect Actual Model. The Cleco 100000100 RB 156 Microstop Cage, Offset Mounting Base is a cemented, hardened and ground chrome-nickel steel spindle mounted on a self lubrificating bronze body and a thrust bearing. Centring-cone of the cutter (120°) for perfect concentricity. Microstop depth adjustment (1 scale division = .001”). The Cleco 100000100 RB 156 Microstop Cage, Offset Mounting Base’s depth setting is held securely in place by locknut with seal. This patented feature allows an easy loosening of the locknut without damage to the drill cage.