• Set includes 3/8 in. Dr. 14 mm, 16 mm, and 21 mm spark plug sockets
• Sockets feature a ball bearing detent retention system that grips the spark plug better than traditional rubber inserts
• The ball bearing detent retention system will not wear out and become loose like a traditional rubber insert
• Constructed of heat-treated chromium-vanadium alloy steel for strength and durability
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