This 75mm diameter screw chuck is a quick and convenient method for mounting a turning blank on your lathe. The central screw is stainless steel with a deep sharp thread for a positive and secure hold. It only requires you to drill a single shallow hole in the blank. It is ideal for smaller or shallow workpieces, (always assess the suitability for the size of the work). For larger pieces, three screw holes are provided in the plate for extra security. For particularly shallow pieces use a plywood spacer to reduce the effective length of the screw. Supplied fitted with an 8mm x 25mm long screw. Two smaller size screws are available separately, useful in making wooden fruit etc.