DURABLE: This versatile 4-piece kitchen router bit set has tungsten carbine tips for a clean cut. CONTENTS: The set includes 1 x flush trim bit 1/4" x 25.4mm x 2.7mm (6.4mm shank) , 3 x straight bits, 2 x 1/2" x 50mm x 12.7mm bits and 1 x 1/2" x 63mm x 12.7mm (12.7mm shank) .