6-POINT CONTACT DESIGN; DESIGNED FOR QUICK & CONVENIENT DIS-ENGAGEMENT OF COUPLER FROM GREASE FITTINGS UNDER PRESSURE. HANDS FREE OPERATION FREE UP A HAND WITH BETTER CONTROL OF THE GREASE . CAN BE USED ON ALL PROFILES OF GREASE FITTINGS SAE DIN BS METRIC. FOR USE WITH MANUAL AIR & BATTERY GREASE GUNS & GREASE PUMPS. NO MORE BROKEN JAWS; NO MORE WASTE; NO MORE BROKEN GREASE FITTINGS; NO MORE MESS