This is a 10-pack of the PS-F-0.5 Clamping Fork which allows to secure a 1.0 in. (25.4 mm) diameter optical pedestal or pedestal base optical post holder anywhere on an optical table. This stainless steel clamping fork provides positioning flexibility with a 0.5 in. (12.7 mm) long 1/4-20 (M6) slot for secure mounting of optical pedestals.