Provides a 4" w x 7" d (10.2 x 17.8 cm) area to secure most clamp style mounting systems. Mounts on either the right or left side of the base stand. Compatible with all Labconco base stands (SoLo, Hydraulic and Telescoping). Mounting arms not included. See part numbers 3997300, 3997400 and 3997900. Installation required.