TIME-SERT Metric Steel Insert M7X1.0X20.0MM Part # 17107 This listing is for (1) ONE insert M7x1.0 Carbon Steel Insert 20.0 Part # 17107 Insert Length Metric is 20.0 The size of the insert refers to the inside diameter and thread pitch. TIME-SERT thread repair system the ultimate way to repair threads in stripped or damaged holes.