10-150 ft lbs variance, 1/2" drive. I got a 1/2" F to a 3/8" M adapter since most of my/Brians metric wrenches are in 3/8". Now I cannot wait to get my Intake Manifold, and while I'm buying those bolts, I'm going to get new exh. manifold bolts and get them torqued down properly. 25 bucks at autozone. They had a 20.00 dollar wrench that was smaller (3/8" drive) and in inch/pounds. Might go pick that one up too just so I can have two.