Grizzly H3412 Cast Iron Faceplate, 4-Inch by 3/4-Inch by 16 TPI Go to amazon.com Related posts Best lathe faceplate Feature16 TPI (Threads Per Inch)Package dimensions: 4.1" x 4.2" x 1.3"Approximate weight: 1.25 lbs DescriptionCast iron provides plenty of mass for smooth turning. Specifications: Size: 3/4" x 4" TPI: 16 Approximate weight: 1.25 lbs.