This is a special spider, designed to minimize / eliminate  visible diffraction patterns. It is made primarily 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
• Vanes have Clinch Nuts built in and come with black mounting screws
• Light weight aluminum block and vanes (3/4 inch tall by 1/16 thick)
• 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 inch or greater Secondary MirrorFor 1.25 inch or greater Secondary MirrorFor 1.5 inch or greater Secondary Mirror
Stainless Steel Mounting Screws	(+$5.00)
What is your tube thickness?	<1/2 inch<3/16 inch<3/4inch