UNIOR: Product featuresmetal balls in the head absorb the impactthose granulate absorb the impactlacquered metal housinglacquered metal tubular handle with plastic grippolyurethane faces are unchangeablehigh securityAdvantages:Advantage over an ordinary hammer is that it doesn´t bounce back from the object because of the steel granulate which absorb the impact.Steel balls in the hammer head prevents rebound and adds additional striking force.Less handle vibration while striking!Usage:Hammer is used for mounting ball bearings, for furniture assembly, interior and exterior lay paving.Not recommended for use on sharp objects. Strike on sharp objects can damage polyurethane face of the hammer.