The Gripp® series, manufactured by Kerb Konus®, is a M14 - M18 self-tapping threaded insert utilized for broken spark plugs thread in the head of the alloy cylinder repairing. Its installation is the same as the Ensat series but the difference is that this series is deeply screwed up into the upper rim comes in an around 1.8mm rest unto the head of the cylinder surface. In addition, the sparks plug sealing is enabled to efficiently work.