18pc Glow Plug Socket Set 8–12mm – Thin‑Wall, Extra‑Deep, Flexi Head – Toolzone ELITE. 3pc 3/8″ Drive Deep Flexi Sockets: 8mm, 9mm, 10mm. 3pc 1/4″ Drive Deep Flexi Sockets: 8mm, 9mm, 10mm. The set includesthin‑wall, extra‑deep and flexi‑head sockets to access tight areas around injector pipes and confined engine bays.