Harrison Design and Consulting have used these 2"x7" aluminum sanding block in their shop for years to be able to level and sand out slide and frame flats to any level of polish that their clients have ordered. They think they work so well, that they wanted to offer them for sale. The clamp plate keeps the abrasive paper pulled taught, while the finger and thumb grooves on the sides help you control and direct the block without tiring you out, trying to keep the paper taught, like on a makeshift sanding block. Harrison Design and Consulting's sanding blocks use a 2" wide piece of sandpaper or 2" wide emory strip. They recommend sheet sandpaper in 9"x11&qu Mfg: Harrison Design & Consulting