These stand off are made using 303 stainless steel. We have found that a softer material is more durable than a hardened material.
The 4mm x 16mm set screws are made using 10.9 grade steel and are anchored with a 4 mm lock nut.
The set screws are JB WELDED IN PLACE TO ENSURE THAT THE SET SCREW DOESN'T BACK OUT.
We have added a 4 mm lock nut to hold the shocks on as we have seen the 3mm break during hard landings.
It will be necessary to drill out the shock tower holes to 4 mm to accept the 4 mm set screw. A drill is provide in the kit.