Introducing the 5DEV 8 Bolt Spider for Shimano Dura Ace Applications.
This spider lets you run our 8 Bolt Cranks with a Shimano Dura Ace 2x System. 
Chainring Bolt Pattern: Shimano 4 Bolt 110BCD for Dura Ace 2X Chainrings (will not work with Ultegra)
Crank Bolt Pattern: SRAM 8 Bolt 
73 grams 
Please note that this spider is cut to work exclusively with Dura Ace 2X Chainrings. 
CNC Machined in San Diego