The Laser Tools Glow Plug Threaded Insert kits have 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 enhanced access Part of the kit is EU Registered design Supplied with 2 sets of 5 threaded inserts, 12mm long & 19mm long. This is to cater for some vehicle manufacturers using longer threads in this size. Made in Sheffield