You are bidding on 2 off M8 x 1.25mm keensert thread repair inserts. The hole you need for fitting is M12 x 1.25 minimum 13.5mm deep as the insert is 12mm long. These can be fitted with care using a spanner through the prongs to drive the insert home and then carefully tap down the locking pins with a small hammer. These are by far the strongest thread repair system we have used. Discount available for larger quantities, just message me. Please see my other listings for other engineering products and exotic metals and plastics. UK postage only as no overseas postage. Cheers John
