The size of the insert refers to the inside diameter and thread pitch.
M8x1.25 SS Insert 8.0 Part #18128 Stainless Steel Metric Insert Size M8x1.25 Insert Length Metric is 8.0 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.