This is the Hot Racing M3 1.5-4.5mm Aluminum Standoff Spacer Set, including 16 total spacers.
Specifications:
Outside diameter of standoff: 5.8mm (.23 inch)
Inside diameter of Standoff: 3.1 mm (.12 inch)
Includes:
- (4) 1.5mm thick spacers
- (4) 2.5mm thick spacers
- (4) 3.5mm thick spacers
- (4) 4.5mm thick spacers