The bushings works on 2 styles M8 bolts and M6.
An M8 bolt can run a max offset of 2mm per bushing.
M6 can run a 3mm offset. I also make different offsets, you can get a 1, 2 and 3 mm offset so if you have a few bushes you can swap them around for different geo to suit different tracks e.g. steep, flat, rocky etc.
When fitted they make the eye to eye of your shock shorter. M8 with two bushes is 4mm shorter M6 is 6mm.
And based of the leverage ratio of your bike it will change the geo.
The average DH bike with M8 bolts a 3inch stroke shock and 9 inches of travel will get about a 0.5inch BB drop and about 1 – 1.5 degree slacker HA.
So the more travel you have with smaller shocks will make the most difference.
The bushes are made of 6082 T6 alu. This means it’s a hard surface and the type of alu is very stiff with no flex.
Hard surface means corrosion resistant and long wear life.
They are drilled and reamed to exactly 8 and 6mm holes so it gives the best possible fit on the bolt (less knocking)
Each bush is ground/sanded and polished for smoothest surface finish and lowest friction (MOAR plush suspension)