Time Sert inserts self locking. On installation the bottom internal threads of the insert are cold rolled to expand the mating external threads into the base material locking the insert in place. M10x1.0 SS Insert 15.0 Part #10104 Stainless Steel Metric Insert Size M10x1.0 Insert Length Metric is 15.0. This listing is for (1) ONE insert. Please Note: The size of the insert refers to the inside diameter and thread pitch.