Circuit Board Holder Overall Length 2 in Number of Mounting Holes 1 Mounting Hole Diameter 5/8 in Material Aluminum Attachment Type Circuit Board Holder Overall Width 14 in Compatible with Manufacturer Model Number 300 Features V-Grooves Compatible with All 300 Series Bases Hold Circuit Boards up to 12 in Wide and up to 0.156 in Thick Shaft is 4.125 in Long and 5/8 in Diameter V Notches Positioned at the Arms Tips 1 lb Overall Depth 10 7/8 in