This is a 10-pack of the M-PS-F-1.0C 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. It includes a M6 cap-head screw that is held captive in the slot of the fork so that it can't fall out. This stainless steel clamping fork provides positioning flexibility with a 1.0 in. (25.4 mm) long slot for secure mounting of optical pedestals.