Red 175E Metal Shift Knob For 6 Speed Short Throw Shifter Selector M16x1.5 Made from SOLID weapons grade 6061 aluminum. 50mm (2") Diameter. Weighted at 175g (6.2oz) for increased positive shift. Design feels super smooth and ROCK-solid. NO SET SCREWS! All-metal threads mean the knob WILL NOT wobble or fall off.