For removing the heater element that can break off during glow plug removal. Saves time not having to remove the cylinder head. Works by drilling/tapping a thread into the broken element so the supplied glow plug adaptors can be used to extract. Supplied with seven drilling/tapping guides and five glow plug extraction adaptors with either a M8 or M10 thread. Features & Benefits:For removing the heater element that can break off during glow plug removal.Saves time not having to remove the cylinder head.Works by drilling/tapping a thread into the broken element so the supplied glow plug adaptors can be used to extract.Supplied with seven drilling/tapping guides: M8 x 1, M10 x 1, M10 x 1.25mm.Five glow plug extraction adaptors: M8 x 1, M10 x 1, M10 x 1.25mm.Thread: M8, M10.Drill Diameter: Ø2.5, 3.3mm.Model No. VS315 Specifications: Model No VS315 Brand: Sealey Contents: Drilling/Tapping Guides; M8 x 1, M10 x 1, M10 x 1.25mm, Extraction Adaptors; M8 x 1, M10 x 1,