SUZUKI GSXR 600 750 06-18 GSXR 1000 03-18 AS3 TOP YOKE STEERING STEM NUT BLUE. AS3 Performance stem nuts are manufactured from 7075 T6 aluminium and are a great upgrade from the OEM stem nuts, they weigh only 21 grams and have an anodized finish to match the rest of our range of CNC machined hard parts.