WM3 (2.15") X 18" drilled to suit Suzuki Disc Front. 18" WM3 = S41-318-VT. Manufactured from 2.0mm (WM2 & WM3) & 1.5mm (WM1) 304 2b Superior Grade Stainless Steel, Individually Hand Welded prior to Roll Forming so making the weld virtually undetectable, Then we polish them to a ".