Pololu Pololu Universal Aluminum 8mm Mounting Hubs (M3)

These Pololu Universal Aluminum 8mm Mounting Hubs (M3) are designed to work with most 8 mm diameter shafts, including round shafts and “D” shafts. Each of the two included hubs has six mounting holes for M3 screws (not included), letting you mount custom wheels or mechanisms to your motors. Designed to work with most 8 mm shafts, including round shafts and ''D'' shafts; Includes one Allen key and four M3 hex set screws; Shaft diameter: 8mm; Each hub has six mounting holes; Sold in pairs