Specification Brand : Taps - Inch - Left Hand BulletPoint1 : Thread Diameter: 1/2" BulletPoint2 : Threads per Inch: 20 BulletPoint3 : Left Hand Threads. High Speed Steel. BulletPoint4 : Recommended Drill Size: 29/64" BulletPoint5 : Plug Style (most common hand tap). ItemName : 1/2-20 LEFT HAND Plug Tap, High Speed Steel ItemPackageQuantity : 1 ItemTypeKeyword : hand-threading-taps Manufacturer : Taps - Inch - Left Hand PartNumber : TALH-1/2-20 ProductDescription : Makes left hand threads in a properly drilled hole (that is, a left hand screw or rod will screw counter-clockwise into this hole). ProductSiteLaunchDate : 2005-02-13T00:00:00.000Z UnspscCode : 39120000