The Sealey VS311 Set is the fast and effective remedy for damage to cylinder head glow plug threads The Sealey VS311 Glow Plug Thread Repair Set includes tools for the precise insertion of threaded inserts into the head and features a unique tap guide system to ensure their correct alignment. This set is the fast and effective remedy for damage to cylinder head glow plug threads. Features: Fast and effective remedy for damage to cylinder head glow plug threads Includes four sizes of threaded adaptors suitable for common sizes of glow plug Set includes tools for the precise insertion of threaded inserts into the head and features a unique tap guide system to ensure their correct alignment Specification: Replacement Inserts (Packs of 5) Inserts: M12 x 1.25mm, M10 x 1.25mm, M10 x 1mm, M8 x 1mm Tap: M14 x 1.25mm, M12 x 1.25mm, M12 x 1mm, M10 x 1.25mm, M10 x 1mm, M8 x 1mm Model No: Size: VS311.01 M8 x 1mm VS311.02 M10 x 1mm VS311.03 M10 x 1.25mm VS311.04 M12 x 1.25mm