TIME-SERT Inch Stainless Steel Insert 1/4-20 X 1.000 Part # 01409. Stainless Steel Inch Insert Size 1/4-20. Insert Length inches is 1.000. 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.