1.easy to use 2.Cr-v steel material ,heat treatment 3.5pc TAP:M6X1.0;M7X1.0;M8X1.25;M10X1.5;M12X1.75 1pc T-TYPE TAP WRENCH 1) Cr-v steel material ,heat treatment2) strong torque can meet your working request3) heavy duty type , practical ,durability and easy to operate4) high quality ,competitive price WLN004 6PC TAP Wrench SET