The Black Diamond Steel Bearing Packer makes greasing bearings quick, clean, and efficient using a standard grease gun. Built with rugged steel construction and a threaded center post, it’s designed for long-lasting performance in automotive, marine, agricultural, and RV applications. The integrated grease nipple easily connects to a grease gun coupler for smooth operation. Suitable for bearings with a minimum 1/2" inner diameter, up to a 5" outer diameter, and heights from 1/4" to 2".