For attaching the inner and outer chainring

Compatibility: Single 4-arm chainrings
Thread: M 8.5 x 0.75
Thread length: 4.5 mm
Sleeve length: 4.7 mm
Tool fitting: 4 mm hexagon socket (screw), 4 mm hexagon socket (nut)
Material: anodized steel

Scope of delivery
4x chainring screw
4x chainring nut