For mounting a column with 70 x 35 mm (2.8 x 1.4 in.) cross section to table boards or work plates or on a 5712 copy table, a 5630 table or a 5618 base stand. Built-in spirit level. Includes fastening screw for the column and installation material (metal counter plate and four M6x40 screws for boards from 28 to 32 mm (1.1 x 1.3 in.) thickness).