This somewhat oversize centre is particularly useful when turning large diameter pieces or roughing unbalanced work prior to chucking, as with end grain hollow forms. The principle is that the increased diameter of the drive greatly reduces the risk of slipping due to the increased leverage resulting from turning a larger diameter workpiece. The prongs bite into the timber for consistent driving. A 4-prong drive minimises the risk of splitting the grain. The centre point helps alignment. Place the point on the centre mark of your workpiece. Give the end of the drive a sharp tap with a mallet rather than using your lathe's tailstock to push the drive home. This method removes any unnecessary pressure on your lathe's bearings.