Now compulsory for all road racing! These Rapid Art Sharks Fins are laser cut from 4mm ali plate deburred and anodized in black or natural . The mounts are drilled 6mm ( mounting hole centres 40mm ) but can be drilled out to 8mm to suit bolting to the back of a race stand lug mount on some models . A separate tapped mounting plate can be supplied suitable for welding to the swingarm for other models at a cost of an extra $20. We can even do the welding for you if you bring the bike into the F1E workshop or send us your swingarm.