Hub Lock Free Wheel Locking Isuzu Trooper Bighorn Invader + DHL EXPRESS 1~Pcs Hub Lock Locking Isuzu Trooper DMax D-Max Holden Rodeo Jackaroo 17~Splines Item Included : 1x Quality New Front Free Wheeling Hub Lock PLEASE NOTE: These free wheeling hubs can ONLY be fitted to models that have 6 x 12mm headed bolts holding the drive plate in the center of the front wheels.( or already has free wheel hubs fitted ) Please check and confirm your vehicle is suitable before ordering. If your vehicle already has free wheeling hubs then these are a direct replacement. Fitting should only take about 5 minutes each. But most of you have locked wheels and these offer a huge benefit. - Gear Spline Teeth: 17 Splines - This Wheel Hub Lock is Manual Lock Application: Isuzu D Max 2005 onwards Isuzu Trooper I and II. Isuzu KB2500. Holden Jackaroo 87 TO 93 Holden Rodeo 91 onwards Yes these suit cars presently with no free wheeling hubs. When engaged everything is like normal and change on the fly still works. It's just now you can dis-engage them and drive along without the wheels forcing the front axles and front diff to turn. That saves power and fuel as well as wear and tear. A popular use is that some people want to slowly back caravans and boats into driveways etc and like to use low range for the slow speed but don't want 4wd because of the turning etc. Please Check the number of splines on your vehicle before purchasing