This is a Grade 5 Titanium Black Finish Allen head bolt that works for headlights, fenders, brackets, license plates, etc. 15mm overall head diameter to cover most hex head locations without washers
these work with the countersunk m6x1 washers in machine finish or burnt finish
https://gdevelopment.us/products/10mm-washer-18mm-diameter?_pos=2&_psq=washer&_psid=8487357ed&_ss=e