(4-- Pack) Smooth-out concrete surfaces with our Power Trowel Stone Holder Attachment with Stones! Perfect for under 36" machines, this 4-Pack includes stone holder attachments with #6 grit stones. Each stone holder comes with 2 x 2 x 8-inch stones, so you can get the job done quickly and accurately. Ships in 2 boxes. Get a professional finish without breaking the bank - order now!