CEI 500 Series: Straight Stump Grinder Tooth. Be the first to review this product. The versatile 500 Series teeth have a 1/2" x 1/2" shank allowing them to fit in standard 1/2" x 1/2" pockets. The pocket does not need to be removed to change the teeth. Simply loosen the bolts, remove existing teeth, replace them with new teeth and ...