This Laser Tools Glow Plug Threaded Insert kit has been developed to allow the repair of an engines glow plug threads as easily as possible with the minimum of dismantling required. The Laser Tools in house designed insert fitting tools are shaped to offer the best possible access to recessed glow plugs while still enabling the insert to be properly fitted. 10.9 High tensile fitting bolts for longer service life.Specially designed fitting tool for significantly improved access. Supplied with 5 threaded inserts, fitting tool, reamer and taps. Made in Sheffield. EU Registered Design.