Hex Head and Square Drive Coverage For Spark Plug Thread Repair Applications The ARES M14 x 1.25 Spark Plug Thread Chaser Tool offers superior versatility for spark plug thread repair. Made of premium heat-treated carbon steel with a corrosion-resistant black manganese phosphate finish for increased durability, longevity, and corrosion resistance, this thread chaser features both a 5/8-inch hex head and a 3/8-inch square drive design, allowing for use with ratchets for ease of clearance where wrenches won’t reach to easily access and repair spark plugs that require M14 x 1.25 thread chasers. Features: Includes: 1 pc. Spark plug thread chaser tool Size: M14 x 1.25 Made of premium heat-treated carbon steel Thread chaser features both hex head and square drive design for additional use with ratchets Black manganese phosphate finish for increased durability and corrosion resistance Suitable for spark plug thread repair for plugs requiring M14 x 1.25 thread chasers