Koken 1 2"Dr Extension Bar 1000mm Kontor Fleet Charge is the original Fleet Charge is the original fully formulated Supplemental Coolant Additive (SCA) pre charged antifreeze 02mm graduations Vernier Caliper Large capacity Venier Caliper with nib style jaws and fine adjustment The jaws have rounded measuring faces for accurate inside diameter measurement Metric and imperial measuring capability Minimum inside measurement of 20mm 4760 Extension Bar 1 2"Dr 1000mmKnurling on the outside of female square drive makes it easier to hold and enables the extension bar to be used like a quick spinner 4760 1 2"Dr Extension Bar 1000mm