43300wrench set pneumatic fan clutchfeatures and benefits: quickly removes and installs fan clutch when repairing the water pump or fan clutch. does the job much faster and easier than conventional fan clutch wrenches. no holding wrenches necessary. the set includes 7 driving wrenches that fit ford gm and chrysler. driving wrench sizes include: 36mm 1-1/2"" 9/16"" 41mm 42mm 1-7/8"" and 2"". drive the fan clutch nut in the opposite direction to replace. use with an air hammer.set includes: 43370 handle assembly 43390 36mm driving wrench 43400 1-9/16"" driving wrench 43410 1-7/8"" driving wrench 43420 2"" driving wrench 43450 42mm driving wrench 43540 1-1/2"" driving wrench 43550 41mm driving wrench