Product name : Helicoil Screw Thread Insert - Metric Coarse Type : Thread Insert Inside diameter:2#, 4#, 6#, 8#, 10# Thread pitch:56, 40, 32, 24 Thread Insert Material : 304 Stainless Steel ***Nominal Length : Maximum drawing length after installation ***Size descriptions such as 2#-56 x 1.5D indicate: ***2#” indicates that the Inside diameter of the thread is 2#。 ***56 The number of threads per inch is 56. ***1.5D indicates that the maximum stretch length after screw installation is 1.5 times the Inside diameter。