The bearing roller feather board fits easily into the T-slot and locks securely, firmly pressing the workpiece against the fence for precise and smooth cuts. The pressure of the spring on the wheels is adjustable, to a certain extent, it can be used as a table saw thin rip jig to get consistent cuts and thin strips. It keeps your fingers away from the saw blade, which greatly improves safety. Soft Coated Wheels These hold the material down on the deck without scaping soft wood. Spring Loaded and Two Way Bearings Roller It allows you to put whatever downward pressure you want on your cut because it is spring loaded, but will still allow you to back your cut out if necessary. Specifications Product Name Bearing Roller Featherboard Model Number ‎MG0-000-0111x2 Material Aluminum alloy Processing method CNC-machined Finish Anodized Product size 4*4.9*0.6inch/100*124*16mm Suspension travel 5mm Pressure Adjustable (Brass knob) Support T-Slot Track 3/4 x 3/8 inch, 3/8 x 1/4 inch T-Slot Track Application Table Saw,Router Table,Band Saw Package included 2 x Bearing Roller Featherboard;4 x T-slot Bolts;4 x T-slot Sliders