Koken 1 2"Dr Extension Bar 1000mm Kontor PRO GLASå¨ Fiberglass Reinforced Body Filler PRO GLASå¨ Fiberglass Reinforced Body Filler combines the durability of fiberglass reinforcement with the workability of light weight filler 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 1 2"Dr Extension Bar 1000mm 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