Rip a straight edge on rough lumber or slabs up to 40'' long and 1-5/8'' thick at the table saw. Just mount this hardware to a straight board or a plywood panel that runs along the saw's rip fence Use with the included adjustable board supports for ripping workpieces from 3'' to 7'' wide. For wider boards, remove the board supports and screw the clamp assemblies to a wider piece of plywood for full support Adjustable board supports can be set to accommodate straight-edge guide boards from 0.7'' to 1-1/8'' thick. Plastic extensions on board supports extend from 3'' to 5-1/4'' and feature interlocking teeth for quick adjustment Clamp assemblies mount to guide board or sheet with included #10 screws and can easily be moved to different guide boards. Clamp assemblies feature ergonomic T-knobs, 3/8'' steel rods with Acme threads, pivoting ball joints and non-marring pads Tall, easy-to-grip handles with rubber overmolds provide comfort and control. Cast aluminum clamp parts with durable powder-coat finish Maximum board dimensions (with board supports attached): 3'' to 7'' Wide x 40'' Long x 1-5/8'' Thick. Maximum board dimensions (without board supports): 40'' Long x 1-5/8'' thick; width varies according to size of shop-made sled Slabs and rough-cut lumber often lack a straight reference edge, which is a must for safe ripping and squaring. If you don't have a jointer or a large band saw, creating that straight edge can be tough. That's where our Straight-Line Rip Hold-Down Clamps come in handy. They make it easy to create a table saw jig or sled that rides against your table saw's fence, resulting in a perfectly straight edge.