This handy tool is designed for reducing soft chain or woven chain. Made of hard boxwood with smooth holes, the user simply pulls the material through consecutively smaller holes reducing the size of the chain. Note that on one side of the block, the holes are slightly chamfered to facilitate pulling the wire through. User may put the tang of the block into a vise, or hold it by hand. Twelve holes ranging in size from 1.2mm to 6.5mm. Measures: 3-1/2" x 2-1/2" x 3/4".