Competition Cams 4793 Crankshaft Socket for Small Block Chevrolet<div style="text-align: left;"><strong>[Product Information]</strong><br><ul><li>For Chevrolet Small Block V8， 90 degree V6 and 4 Cyl.， and Ford 4.6L</li><li>1.255 inch ID with 3/16 inch Keyway</li><li>Specially designed 1/2 inch drive socket allows rotation of engine assembly</li><li>Knurled retaining nut that holds degree wheel in place</li><li>Can be loosened while on crank snout so that wheel can be turned independent of the engine when finding TDC</li></ul></div><img src="http://ecx.images-amazon.com/images/I/31WljPqsk1L.jpg" noproxy>