The Sealey VS315 Glow Plug Heater Element Removal Set saves time not having to remove the cylinder head The Sealey VS315 is a Glow Plug Heater Element Removal Set, designed for removing the heater element that can break off during glow plug removal. This set is supplied with seven drilling/tapping guides and five glow plug extraction adaptors with either an M8 or M10 thread. It works by drilling/tapping a thread into the broken element so the supplied glow plug adaptors can be used to extract. Features: Saves time not having to remove the cylinder head For removing the heater element that can break off during glow plug removal Supplied with seven drilling/tapping guides and five glow plug extraction adaptors with either an M8 or M10 thread Works by drilling/tapping a thread into the broken element so the supplied glow plug adaptors can be used to extract Comes With: Tap & Threaded Rod Sizes: M3 x 0.5, M4 x 0.7mm  Extraction Adaptors: M8 x 1, M10 x 1, M10 x 1.25mm  Drilling/Tapping Guides: M8 x 1, M10 x 1, M10 x 1.25mm  Specification:  Model No: VS315  Drill ∅: 2.5, 3.3mm