The EDC Cap Kit includes the worlds lightest headset top cap (4.2g), and an EDC steerer plug with drain hole which keeps crud out of your steerer. Top caps are compatible with all 1-1/8" aluminum steerer tubes. The EDC steerer plug is required for EDC tool storage and is compatible with most aluminum tapered steerer tubes. Check fork compatibility. KIT INCLUDES * EDC TOP CAP * EDC steerer plug * 2x 1mm, 3mm, & 5mm Headset Spacers