The suction cup allows rapid attachment to any smooth non-porous surface, but the holder may also be screwed down. The ball joint may be swiveled in all directions. The 1.33 (34mm) bore accepts all MICROMOT machines, either directly or via the .75" (20mm) reducing bushing (included). NOTE: Tool is not included #PRO28603 Price.....$36.95 Proxxon Index