The Knife Edge primary baffle is designed to work with the listed Sky-Watcher newtonian mirror cell. The baffle seats over the mirror clips eliminating unwanted shadowing caused by the primary mirror clips. 
 
Knife Edge 150P Baffle does reduce the working aperture of the telescopes to 140mm. 
 
All Kife Edge primary baffles are 3D printed with PETG filament. This allows the material to keep shape in high temperature and moister without losing shape. 
 
Designed and printed in the USA.