Tri Source™ Polar Solar Plus® Multiple Outlet Cord, 50 ft, 3 Outlets, Yellow ORS NASCO Filling material is staple set Filling material is staple set in a smooth wax tumbled hardwood block Split bite jaw increases grip over standard bite chucks by providing more contact with the bit Superior gripping force provides high mechanical advantage to convert hand tightening torque into superior bit gripping force Hammerlock® mechanism is a positive locking mechanism that prevents loosening in hammer and other high vibration applications Anti lock nut prevents chuck from lock opening Precision operation that meet or exceed stringent din run out and dimensional specifications Heavy duty strain relief protects electrical connections resulting in longer cord life Outer jacket is flame retardant and water resistant Reinforced blades help prevent accidental bending or breaking