BikeMaster Adjustable Micrometer Torque Wrenches offer you versatility with their reversible ratchet head.; Available in 3/8" or 1/2" drive Reversible ratchet head Micrometer-type sleeve allows accurate pre-set torque values to be set 3/8" wrench drive marked range is 10-80 ft.-lbs. 1/2" wrench drive marked range is 20-150 ft.-lbs.