Premier Spark Plug Socket 1/2"Sq Drive 21mm

• One of a comprehensive range of Premier Hand Tools, suitable for daily professional use. • Cold-forged Chrome Vanadium steel socket. • Hardened, tempered and chrome plated. • Fully polished mirror finish with knurled ring. • Socket insert grips ceramic insulation and assists in extraction of plug. • Especially useful on deep-seated plugs. • Lifetime guarantee*.