TIME-SERT Metric Steel Insert M7X1.0X18.0MM Part # 17105 This listing is for (1) ONE insert M7x1.0 Carbon Steel Insert 18.0 Part # 17105 Insert Length Metric is 18.0 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.