Wiggler Set with Center Finder Ball Diameter 1/4 in Construction Steel Disc Diameter 0.1 in Includes (1) Pointed Shank Ball Contact Disc Contact Number of Pieces 4 Single or Double End Single End Tip Diameter 0.25 in (Point) Tip Shape Point Features Spring Tension Machine Spindle Working Centre Includes Case No Overall Length 5 in Shank Diameter 3/8 in