Description: Type: Harmonic Balancer Installation Tool Condition: Brand New Fitment Type: Direct Replacement Material: Steel Finish: Black Installer Style: Threaded Thread: 5/8"-16, 7/16"-16 Part Number: 66515 Feature: Made from High-Quality Steel Makes Installing The Balancer Simple Just Thread Proper End Into Crankshaft and Rotate the Nut Pressing Bearing Against Balancer 5/8-16 & 7/16-16 Threaded Ends Not To Be Used For Removal - Installs Only Fitment: For Chevy Small Block & Big Block Crankshafts .