Engine Rotation Socket-  a must-have tool for any occasional or professional engine builder.  
 
Being able to quickly, easily, and accurately turn your motor over while it's being assembled is an absolute must.  These sockets are thick-walled and tough as nails.  The spline fit has intentionally been made with just a hair of extra play so the socket slides onto your sprocket shaft with ease, even if it's an old shaft that has a couple burs or defects in it.  Socket is constructed of 4140 and is build to last a lifetime.