This accessory is not meant to imply that you can part off large stock, but many people leave their riser blocks in place when doing operations on small diameter stock, and this accessory allows you to use the cutoff tool without removing the riser blocks. It is used on the "back" side of the part with the blade upside down to reduce "chatter". The extra wide base adds to stability. Includes T-nuts and hold-down screws. (Cutoff tool and holder P/N 3002 are shown but sold separately.)