The size of the insert refers to the inside diameter and thread pitch.
M10x1.25 SS Insert 20.0 Part #10126 Stainless Steel Metric Insert Size M10x1.25 Insert Length Metric is 20.0 Professional Thread Repair TIME-SERT® thread repair system the ultimate way to repair threads in stripped or damaged holes. This listing is for (1) ONE insert Please note: The size of the insert refers to the inside diameter and thread pitch.