Shop › Thread covers Image 1 of 2 Image 2 of 2 Thread covers $7.50 sold out 3d printed Barrel tenon covers have a flat on the bottom to prevent barrels from rolling off the work bench. Thread Pitch: Select Thread Pitch M27x2 M30X2 1-1/16 16 TPI 5/8-24 1/2-28 1-20TPI 1-1/16 20 TPI Sold Out Added! 3d printed Barrel tenon covers have a flat on the bottom to prevent barrels from rolling off the work bench.