Machined from solid billet 6061 T6 aluminum and anodized black, the AXIS Dual Bar features a 5/8 In. baby pin on top for mounting wireless receivers, wireless transmitters, antennas and other accessories that connect to a baby pin. The Dual Bar has a total of eighteen 3/8-16 threaded holes providing you several mounting points to position the two included baby pins. Depending on the size of the monitors you will be mounting, you may want to have the pins further or closer together. The AXIS Dual Bar includes the Dual Bar and two "threaded" style 5/8 In. Baby Pins. The max capacity of the AXIS Dual Bar is 80lb.