This reversible head ratchet gives you options. BikeMaster® Adjustable Micrometer Torque Wrenches offer you versatility with their reversible ratchet head. It features a micrometer-type sleeve that allows accurate pre-set torque values to be set. 3/8" Sq. Dr. marked range (5 - 80 lb/ft). 1/2" Sq. Dr. marked range (20 - 150 lb/ft). Reversible ratchet head. Micrometer-type sleeve allows accurate pre-set torque values to be set.