The KTT10S1SQ is a steel square soft lathe chuck jaw with 3 jaws. It features a 1.5MM X 60° serrated attachment and a 1.1811 inch BTW mount hole centers, making it suitable for various chucks. Measuring 4-1/2 inches long, 1-1/2 inches wide, and 3 inches high, this jaw ensures reliable and precise gripping for your lathe chuck. It has a 0.6299 inch groove and a 0.4724 inch & 12mm fastener for secure fastening.