This 2 aperture blade consists of two symmetric open spaces and 2 symmetric closed spaces. Hence the "open" time is the same as the "closed" time. The blade is made of sheet aluminum with thickness ranging from 0.025-0.07". The blade is made with an electrical discharge machining (EDM) process where a laser cuts the blade pattern onto a thin aluminum sheet. The blade is then anodized black. There are three screws at the center that mount it to the chopper shaft coupler.
 
Technical Specifications:
Blade thickness: 0.025-0.07"
Mount: three screws to chopper motor shaft coupler
Outer blade diameter: 4" (4.5" option available)
Reflective Surface Available
Contact sales@sciencetech-inc.com for details and pricing on options.