Product information "TRUE-FLEX™ Featherboard TWIN PACK" The Twin Pack True-FLEX™ Featherboards provide a consistent and optimum pressure, and will stand up to years of heavy use in your woodshop. The Featherboard is made from an extremely durable plastic composite body and includes a Wedge-Lock™ System that allows the Featherboard to be secured to a variety of shop tools without the need for additional hardware. Whether you’re using a miter slot or a T-slot, working on a table saw or a router table, the Wedge-Lock™ System adjusts accordingly and lets you work with confidence. Designed for use in standard 9 mm x 19 mm miter slot.