Holmarc Opto-Mechatronics Pvt. Ltd. Offers Standard Post Base of 9mm Thickness. Holmarc Opto-Mechatronics Pvt. Ltd. Supplies precision manipulators. Standard Post Base of 9mm Thickness can be used to mount post holders anywhere on the breadboards irrespective of the position of the tapped holes. Standard Post Base of 9mm Thickness is made of aluminum alloy.