They should be suitable for most uses, though feel free to ask if unsure about your particular case. LIGHT BROWN. DARK BROWN.
eBay
ZTTO Bicycle Headset Stem Fork Top Cap 1-1/8" Threadless Headset Parts MTB Road Bike Aluminum Cover Headset Stem Screw M6x30mm
Aliexpress UK
To suit 6 & 8 gauge screws. Wher screws are added they are 20mm long. Available in Black, White or Yellow. One piece hinge design.
eBay
ZRACE 4g Extremely Lightweight Bicycle Stem / Headset Cover Top Cap with Screw
Aliexpress UK
Different colours available.
eBay
ZRACE CNC Chainring Bolts Covers 7075AL Chainwheel Screws Nuts For FC-R7000 FC-R8000 RC-R9100 / 105 Ultegra DURA-ACE Crank Bolt
Aliexpress UK
Beautify and protect the screws. Colour: Black, White, Light Gray, Dark Grey. Plastic snap screw cover, durable, anti-aging, waterproof and smooth on surfaces. We will try our best to deal with the problem to make you satisfied.
eBay
Bicycle Headset Cap Burnt Blue MTB Road Bike Stem Headset Top Cap Cover with Screw for 28.6mm Fork Head Tube Cycling Accessories
Aliexpress UK
Brand New BG Nexus Spare Screw Caps (Pack of 10) These are spare screw caps for the Nexus range, once you remove a socket or switch from its location or make any changes to the faceplate the original covers end up damaged or scratched or worse not reusable. Easy to install high quality white screw cap covers, for use with the BG Nexus standard white plastic range.Approximately Size Diameter - 8mm, Thickness - 2mm These are NOT universal spare screw caps, these are specifically for the BG Nexus range of switches and sockets. If yours is not this do not purchase. There is no such thing as universal as each manufacture will have their own spares specifically for their sockets and switches.
eBay
ENLEE Bike Crank Cover Crank Screw Aluminum Alloy Mountain Bike Color M18 M20 Compatible With Himano IXF M19 Bicycle Crank
Aliexpress UK
Suitable for Countersunk screws. - Furniture upholstery. ALL PRODUCTS GLOSS FINISH FOR 10-12 Gauge screws. - A plastic washer (base), through which he screw is inserted. - A plastic cap, which locks over the washers, providing an air & watertight seal that protects fastener head from rust and corrosion.
eBay
RISK M20x8mm M6x18mm Titanium Bicycle Crankset Cover Bolts XT XTR Mountain Road Bike Plum Blossom Bottom Bracket Crank Arm Screw
Aliexpress UK
If the screws are badly rusted, a numberplate can often be simply pulled off in seconds. Problem 1 - Corrosion (Rusting) of fixings You buy a new car - your Pride & Joy! You wash it every week and really look after it.
eBay
NFOX multi-function Hydraulic Brake Maintenance Bleed Needle Multi Bicycle Repair Tool Bike EZmtb Kit Oil Pipe Cut screw cover
Aliexpress UK
Material: Plastic. The images of products are for representation purposes only. Color: Multi-color. Anything else you need?. < Product Information >.
eBay
Risk Bike Parts Headset Cap Kit M6*30MM Bicycle Stem Bolts Ultralight Hollow Screw Bicycle Headset Top Cover Titanium Alloy Bolt
Aliexpress UK