Perrin PSP-INR-102BK SHIFT KNOB - LARGE BLACK Fat Knob Width 	1.8" Fat Knob Weight 6.8oz Machined from billet aluminum, PERRIN shift knobs are light weight and balanced perfectly for a quick shift every time. The PERRIN shift knobs height can be adjusted by as much as 1 inch with the built-in adjustment screw. Once the height is set, tighten the lock bolt and your knob will never loosen on it's own. Best of all, our super locking mechanism will not harm the threads of your shifter!