From the Manufacturer

Be certain the position of your blade is precisely maintained. A critical component in maintaining blade alignment. Rugged ball bearing design, yet compact enough to fit the saw without compromising cut height or table tilt. Lubricated and sealed for life. Bearings adjust forward, backward and side to side for maximum flexibility in blade size. Blade widths from 1/8 in. up to 1 in. accommodated. Blade friction is reduced from the rolling bearings that contact the side of the blade, for a cooler blade and smoother cuts. Easy to install and includes all mounting hardware and instructions.