Orion Pier Extension for Sirius Pro Mount Handy extension increases the height of the Sirius Pro AZ/EQ-G Mount for added versatility and comfort Sturdy metal extension adds 6.3" of height to the Orion Sirius Pro AZ/EQ-G GoTo Mount head Essential for comfortable use of refractor and Cassegrain telescopes on the compact Sirius Pro Mount Raises focuser and eyepiece of attached telescopes to a more convenient height Made of machined metal with a black powder coat finish