No bolt holesMachining is required before mounting your chuck to ensure concentricityFor 3 & 4-jaw chucks
Threaded 2 1/4-8 Backplate/Adapter for 8" Lathe Chucks No bolt holes. Machining is required before mounting your chuck to ensure concentricity. For 3 & 4-jaw chucks.
Brand: HHIP, Model: 3900-3326, Size: 8" Size, 2-1/4"-8 Thread