ITEM NAME:10Pcs Cycling Bicycle Headset Cover Bolt Screw Nut Head Covers Cap for M6 Bolt Description: Providing quick and neat finishing for inside hexagon screws. The headset caps provides protection against dust and dirt. These have absolutely simple and elegant design, just nice, solid color. Easy installation. Place the bulge of the cover on to the hex screw hole. Specification: Material: Plastic Top Diameter: Approx. 10mm/0.4inch Height: Approx. 4.7mm/0.19inch Bottom Outer Diameter: Approx. 5.2mm/0.2inch Package Includes: 10 Pieces Hexagon Headset Cover SKU: DMO0020858065005259.10 Pieces Hexagon Headset Cover. Place the bulge of the cover on to the hex screw hole. Height: Approx. Providing quick and neat finishing for inside hexagon screws.