TOUGH & DURABLE construction with a 24 tooth ratcheting head and high quality alloy steel, heat treated for long service life. "CLICK" STYLE MICROMETER provides audible feedback when preset torque is achieved. Drive sizes of 3/8" and 1/2", with ranges of 10 - 100 Ft-Lbs. and 20 - 150 Ft-Lbs. respectively. Accuracy of ± 4% clockwise, ± 6% counterclockwise. MEETS ASME B107.300. MADE IN THE U.S.A.