GEARWRENCH Torque Multipliers are the most accurate and easy to use tools available. 750 Foot Pound Torque Multiplier GEARWRENCH 750 Foot Pound Torque Multiplier is the perfect tool for any job you need to get done right. The micrometer wrenches are available in fixed head and flex head, while the flex head wrenches are available in 3/8" and 1/2" drives. GEARWRENCH family of torque wrenches & torque products offer the latest innovations in torque measurement.