The No.22 is a large version of the No.10 blade with a curved cutting edge and a flat, unsharpened back edge. Used for skin incisions in both cardiac and thoracic surgrey and to cut the bronchus in lung resection surgery. Larger than the No.20 and No.21 the No.22 fits handles 4, 4L, 4 Graduated & 6B SKU: 0208