Holmarc Opto-Mechatronics Pvt. Ltd. Manufactures Heavy Duty Solid Breadboard. Holmarc Opto-Mechatronics Pvt. Ltd. Supplies precision manipulators. Heavy Duty Solid Breadboard is available in 18mm. Thickness. Heavy Duty Solid Breadboard can be used for building rigid setups. These are available in various shapes, sizes and with different patterns of tapped holes other than standard models.