New and High Quality Direct Replacement TYPE:Harmonic Balancer Installation Tool Manufacturer's number:66515 Installer Style:Threaded Thread:7/16inch -20, 7/8inch -14, 1/2inch -20 Made from High-Quality Steel Makes Installing The Balancer Simple, Just Thread Proper End Into Crankshaft and Rotate the Nut Pressing Bearing Against Balancer 1/2inch-20 & 7/16inch-20 Threaded Ends Not To Be Used For Removal - Installs Only Fitment:For Small/Big Block for Chevy Cranks Colour:Black Material:Metal Package Contents: 1 * Harmonic Balancer Installation Tool Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.