Tru-Sharp surgical steel blades and handles made from impact-resistant synthetics or beautiful rosewood mean these working knives will last as long as you do maybe longer. W.R. Case Working Knives. Peanut #0046. 6220 SS. Clip and Pen Blades. Clip blade length: 2". Pen blade length: 1 1/2". 2 7/8" closed. 4 3/4" open. Weight: 1.2 oz.