This is a special spider, designed to minimize / eliminate  visible diffraction patterns. The Vanes and main block are made of aluminum, making it lightweight. The unique center bolt, Spring, and Tensioning Nut, make collimation simple and easy while allowing a large range for adjusting.

It also features:

• Easy Front Access to Stainless Steel Collimation Set Screws
• Allen Wrench for Collimation
• Constant tension of diagonal to Collimating Screws
• Light weight aluminum block and vanes (1 inch tall by 1/16 thick)
• Vanes have Clinch Nuts built in and come with black mounting screws
• This Curved Vane Telescope Spider comes with a secondary holder.

Available Options:
Clinch Nut Size	1/4-20 (Default)8-32
Inside Diameter of your tube?
Secondary Mirror Holder size.	For 1.25 inch or greater Secondary MirrorFor 1.5 inch or greater Secondary MirrorFor 2 inch or greater Secondary Mirror
Stainless Steel Mounting Screws	(+$5.00)
What is your tube thickness?	<1/2 inch<3/16 inch<3/4inch